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--- report:soa [2026/04/12 23:30] – [2.3 Products] team4
+++ report:soa [2026/05/01 18:11] (current) – [2.4 Companies] team4
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 ===== 2. Background and Related Work =====
-//This chapter provides the reader with the relevant technical-scientific background as well as existing related products and research, also known as the state of the art, in the field(s) of the project.//
 ==== 2.1 Introduction ====
-This chapter establishes the technical and scientific foundation for the MARIS HABITATS project by situating it within the broader landscape of underwater monitoring and artificial reef design. While the field of marine biology has long utilized static structures for habitat restoration, the integration of real-time IoT (Internet of Things) capabilities remains a significant hurdle due to high costs and technical complexity.
-By analyzing essential water quality parameters—such as pH, temperature, and turbidity—and the embedded systems required to track them, we identify the specific technical gaps that our modular approach aims to fill. This review serves not only as a state-of-the-art summary but as a justification for a cost-effective, sensor-integrated platform that moves beyond traditional, "passive" artificial reefs.
+This chapter establishes the technical and scientific foundation for the MARIS HABITATS project by situating it within the broader context of artificial reef design and underwater environmental monitoring. Traditional artificial reefs are usually passive structures that provide physical habitat support, while marine monitoring systems are often treated as separate technical equipment.
+MARIS HABITATS aims to connect these two areas by combining modular reef infrastructure with a removable smart sensor box. Instead of focusing on real-time data transmission, the system is designed for long-term local data logging. This approach reduces technical complexity and makes the concept more realistic for a low-power underwater system.
+The chapter reviews artificial reef concepts, existing companies, material options, sensor placement challenges, and biological and geographical factors. This background helps justify the project direction: a modular reef block system supported by environmental data collection rather than a fully live underwater IoT platform.
 ==== 2.2 Concepts ====
-Artificial marine habitats can be designed in several ways to help restore marine ecosystems and support endangered fish species. One approach is the use of 3D-printed reef corals, which can be made from materials such as ceramic, limestone, or eco-concrete. These materials are durable and suitable for marine environments. Examples of projects using this approach include the Reef Design Lab in Australia and SECORE coral restoration projects, both of which focus on rebuilding reef structures that allow coral and marine organisms to grow again [(Reef Design Lab)], [(SECORE)].
+Artificial marine habitats can be designed in several ways to help restore marine ecosystems and support endangered fish species. One approach is the use of 3D-printed reef corals, which can be made from materials such as ceramic, limestone, or eco-concrete. These materials are durable and suitable for marine environments. Examples of projects using this approach include Reef Design Lab in Australia, which develops 3D-printed reef structures for marine habitat restoration, and SECORE coral restoration projects, which focus on rebuilding damaged coral reefs by supporting coral growth and reef recovery [(Reef Design Lab)], [(SECORE)].
 Another commonly used solution is reef balls. These are concrete dome structures with holes that mimic natural reef caves. Because of their simple design they are easy to mass produce and very stable when placed on the seabed. The holes and cavities provide immediate shelter for fish and other marine animals, allowing the structures to quickly function as protective habitats [(Eternal Reef)], [(Reef Innovations)].
@@ Line 16: / Line 22: @@
 A different method is the creation of Bio-Rock or electric reefs. These reefs consist of metal structures through which a small electrical current is passed. This current causes minerals from seawater to deposit onto the structure, gradually forming a limestone-like coating. This process helps corals grow much faster than under normal conditions, and fish rapidly colonize these artificial reefs. This technique is known as Bio-Rock technology [(BioRocks)].
-Artificial habitats can also be designed as modular “fish cities.” These structures include holes of different sizes so that multiple fish species can use them for shelter. Vertical elements are often incorporated to mimic natural reef cliffs, and the modules can be interconnected to create more complex ecosystems that support a greater diversity of marine life [(rrreefs)].
+Artificial habitats can also be designed as modular “fish cities”. These structures include holes of different sizes so that multiple fish species can use them for shelter. Vertical elements are often incorporated to mimic natural reef cliffs, and the modules can be interconnected to create more complex ecosystems that support a greater diversity of marine life [(rrreefs)].
 Another concept is the development of living seawalls. These are harbor walls or seawalls designed with textured panels and cavities so that marine organisms can attach to them and live on them. Instead of smooth concrete surfaces that support little life, these modified structures create habitats for algae, small invertebrates, and fish [(Living seawalls)].
@@ Line 23: / Line 29: @@
 In habitat design, the shape of the structure is often more important than the material used. It is important to include many holes and cavities in different sizes so that different fish species can find suitable shelter. Vertical structures are also important because they mimic natural reef cliffs. In addition, rough surface textures help corals and algae attach and grow on the structures. Finally, ensuring good water flow around the habitat is essential, as it brings nutrients and oxygen that support marine life.
+==== 2.3 Comparative Analysis ====
+The selected companies and solutions are evaluated based on criteria such as reef structure, modularity, material approach, monitoring capability, data collection method, maintenance, and suitability for long-term environmental observation.
+Since MARIS HABITATS is designed to observe how an artificial reef and its surrounding marine conditions change over time, the comparison does not only consider ecological enhancement. It also considers whether each solution can collect, store, and retrieve environmental data.
+<table tab:comparison>
+<caption> Comparative overview of existing artificial reef companies and the proposed MARIS HABITATS system </caption>
-==== 2.3 Products ====
-**MEITEC**
+^ Criteria ^ ECOncrete ^ Reef Design Lab ^ IntelliReefs ^ Biorock ^ MARIS HABITATS ^
+| Main business focus | Eco-enhanced marine concrete infrastructure | Designed and 3D-printed reef structures | Artificial reef restoration using engineered materials | Mineral accretion reef technology | Modular reef infrastructure and environmental data |
+| Product type | Marine infrastructure units | Reef modules / design services | Reef structures | Electrified reef structures | Reef blocks + removable smart sensor box |
+| Modularity | Moderate | High | High | Low to moderate | High |
+| Ecological design focus | High | High | High | High | Moderate to high |
+| Integrated sensors | No clear indication | No clear indication | No clear indication | Not a core feature | Yes |
+| Real-time data transmission | No clear indication | Not specified | Not specified | Not a core feature | No |
+| Long-term local data logging | No clear indication as a core product feature | Not specified | Not specified | Not a core feature | Yes |
+| Data retrieval method | Not specified | Not specified | Not specified | Not focused on data retrieval | SD card / scheduled annual retrieval |
+| Service model | Project-based infrastructure | Design and project-based reef solutions | Restoration project-based | Project-based installation | Reef modules + optional monitoring service |
+| Main differentiation | Ecological concrete material | Complex reef design | Alternative reef material/design | Electrical mineral accretion | Removable sensor box and long-term environmental data |
-MEITEC is a company that designs and builds artificial reef structures for marine environments, mainly to support and improve fishery resources [(MEITEC)]. Their products are usually made from strong and durable concrete, which helps the structures stay stable on the seabed even when they are exposed to waves and ocean currents. These reef structures create spaces where marine species can hide, live, and reproduce, which can lead to an increase in fish populations over time.
+</table>
-In some cases, MEITEC also includes simple measuring devices, such as flow meters and water temperature sensors. However, these devices seem to be used separately rather than as part of a connected system. There is no clear indication that the system can collect or process data continuously, and advanced features such as real-time monitoring are not described [(MEITEC)].
+The comparison presented in Table {{ref>tab:comparison}} is based on publicly available information from company websites, project descriptions, and related documentation. The selected companies represent different approaches in the artificial reef and marine infrastructure market, including eco-enhanced concrete, modular reef design, alternative reef materials, and technology-assisted reef growth.
-Figure {{ref>fig:MEITEC}} presents the flow meter and water temperature meter.
+As shown in Table {{ref>tab:comparison}}, ECOncrete focuses on bio-enhancing concrete infrastructure, while Reef Design Lab and IntelliReefs focus mainly on complex and modular reef structures. Biorock is different from passive reef systems because it uses low-voltage electrical current to support mineral accretion. However, based on the available information, these companies do not clearly present a removable sensor box with long-term local data logging as a core product feature.
+MARIS HABITATS is therefore positioned differently. The project does not focus on proving immediate biological recovery, but on providing modular reef blocks and collecting environmental data over time. The smart sensor box stores data locally on an SD card and the data is retrieved during scheduled maintenance, approximately once per year. This allows the system to support long-term observation of how the reef structure and surrounding marine conditions change over time.
+==== 2.4 Companies====
+This section presents existing solutions related to artificial reef systems and marine infrastructure. The purpose of this analysis is to understand how current solutions are designed and what features they provide. It also helps to identify limitations that can be considered in the development of the proposed system.
-<WRAP center>
-<figure fig:MEITEC>
-| {{:report:메이텍.jpg?nolink&420}} | {{:report:메이텍2.jpg?nolink&420}} |
-<caption>MEITEC flow meter and water temperature meter</caption>
-</figure>
-</WRAP>
 **ECOncrete**
-ECOncrete develops special types of concrete that are designed to be more environmentally friendly and better suited for marine life [(ECOncrete)]. Instead of focusing only on strength, their technology also considers how the material interacts with the surrounding ecosystem. For example, they adjust the chemical composition and surface texture of the concrete so that it becomes easier for marine organisms to attach and grow. These solutions are commonly used in coastal structures such as seawalls and breakwaters, where they help support marine life while still performing their structural role.
+ECOncrete is a company that develops bio-enhancing concrete technologies for coastal, marine, and offshore infrastructure. Its solutions are designed to improve the ecological performance of concrete structures while still maintaining their engineering function. The company’s approach is applied in infrastructure such as ports, seawalls, coastal protection systems, offshore assets, and subsea cable protection.
+The main idea of ECOncrete is to make marine infrastructure less biologically poor than conventional smooth concrete structures. This is achieved through changes in concrete composition, surface texture, and structural design. According to the Living Ports project, ECOncrete’s rough and irregular surfaces, gaps, and swim-through holes can create habitats, shelter, and breeding spaces for marine organisms [(CORDIS2025)].
-Even though ECOncrete provides clear ecological benefits, their systems mainly act as fixed structures. They help marine life grow, but they do not include any built-in sensors or systems that can track environmental conditions. As a result, there is no real-time monitoring or data collection integrated into their designs [(ECOncrete)].
+One example of ECOncrete’s application is the Living Ports Project at the Port of Vigo. In this project, ECOncrete Coastalocks and ecologically enhanced seawalls were used to create nature-inclusive port infrastructure. As shown in Figure {{ref>fig:ECOncrete}}, marine growth can develop on these concrete elements over time, showing how infrastructure can maintain its coastal protection function while also supporting ecological value.
-Figure {{ref>fig:ECOncrete}} presents armor block units of ECOncrete.
+However, ECOncrete is different from MARIS HABITATS in its main focus. Based on the available product descriptions, ECOncrete mainly provides bio-enhancing concrete infrastructure rather than a modular reef system with a removable sensor box. There is also no clear indication that long-term local data logging is included as a core product feature. Therefore, ECOncrete is a useful benchmark for ecological concrete design, while MARIS HABITATS aims to add environmental data collection through a removable smart monitoring unit.
 <WRAP centeralign>
 <figure fig:ECOncrete>
-{{ :report:에콘크리트.webp |}}
+{{ :report:cordis.jpg?nolink&600 |}}
-<caption> ECOncrete Armor Block units </caption>
+<caption>
+ECOncrete bio-enhancing coastal protection units used in the Living Ports Project at the Port of Vigo [(CORDIS2025)]
+</caption>
 </figure>
 </WRAP>
+**Reef Design Lab**
+Reef Design Lab is an Australian design and fabrication company that develops artificial reef and marine habitat solutions. The company describes its work as the design, prototyping, and manufacturing of coastal solutions, with a focus on improving ecological performance in artificial reefs and coastal habitat infrastructure [(ReefDesignLab)].
+One of its well-known systems is MARS, which stands for Modular Artificial Reef Structure. MARS is a ceramic 3D-printed modular system designed to construct reef habitat without the need for heavy-duty equipment. The system can be deployed from small boats and assembled by divers, making it suitable for reef restoration projects in locations where large marine construction equipment may be difficult to use [(ReefDesignLabMARS)].
+Reef Design Lab is relevant to MARIS HABITATS because both projects use modular reef structures and focus on creating physical habitat infrastructure in underwater environments. The use of repeated modular units also makes Reef Design Lab a useful benchmark for comparing scalability, deployment, and structural complexity.
+However, Reef Design Lab differs from MARIS HABITATS in its main focus. Based on the available product descriptions, Reef Design Lab mainly focuses on reef design, 3D-printed structures, and project-based marine habitat solutions. There is no clear indication that a removable sensor box or long-term local environmental data logging is included as a core product feature. Therefore, Reef Design Lab is useful as a benchmark for modular reef design, while MARIS HABITATS aims to combine modular reef blocks with a removable smart monitoring unit for long-term environmental observation.
+<WRAP centeralign>
+<figure fig:ECOncrete>
+{{ :report:products_mars_new_hero.webp |}}
+<caption>
+Reef Design Lab's MARS system, a ceramic 3D-printed modular artificial reef structure [(ReefDesignLabMARS)]
+</caption>
+</figure>
+</WRAP>
 **IntelliReefs**
-The IntelliReefs project, developed by the Reef Life Foundation, focuses on creating modular reef systems that do not rely on traditional concrete materials [(IntelliReefs)]. Instead, they use alternative materials that are more environmentally friendly and suitable for marine ecosystems. One of the main advantages of this system is its modular design, which allows different pieces to be combined in flexible ways. This makes it possible to create more complex structures that can better match different underwater environments.
+IntelliReefs is a reef restoration initiative and technology platform connected to Reef Life Foundation. It focuses on engineered artificial reef structures made from Oceanite, a bio-enhancing marine substrate designed to mimic natural ocean mineral compounds. According to IntelliReefs, Oceanite can be customized according to site, species, and function, and is used to create reef modules that support coral, seaweed, kelp, and other marine life [(IntelliReefs)].
-Although IntelliReefs offers flexibility and uses sustainable materials, the available information does not show that the system includes any type of sensor or monitoring technology. Similar to the other solutions, it focuses mainly on providing habitat, without offering tools for real-time environmental data collection or analysis [(IntelliReefs)].
+The main idea of IntelliReefs is to use material science and reef design together. Its Oceanite material is described as a complex mineral matrix held together by a proprietary nanobinder, developed to support diverse species growth and integration into local ecosystems [(IntelliReefsResearch)]. The structures are designed with textured and porous surfaces, as well as small spaces where marine organisms can attach, be protected, and grow over time.
+As shown in Figure {{ref>fig:IntelliReefs}}, IntelliReefs uses modular reef units that can be arranged to create complex underwater habitats. These structures are relevant to MARIS HABITATS because both concepts use modular reef elements and aim to create underwater infrastructure that can interact with the surrounding marine environment.
+However, IntelliReefs differs from MARIS HABITATS in its main focus. IntelliReefs mainly emphasizes bio-enhancing materials, reef restoration, and ecological growth through Oceanite-based structures. Based on the available product descriptions, there is no clear indication that a removable smart sensor box or long-term local environmental data logging is included as a core product feature. Therefore, IntelliReefs is a useful benchmark for alternative reef materials and ecological reef design, while MARIS HABITATS aims to combine modular reef blocks with removable sensor-based monitoring for long-term environmental observation.
-Figure {{ref>fig:IntelliReefs}} presents one of the projects of IntelliReefs
 <WRAP centeralign>
 <figure fig:IntelliReefs>
-{{ :report:intellireef.png?nolink&600 |}}
+{{ :report:intellireefs.png?nolink&600 |}}
-<caption> IntelliReefs Project </caption>
+<caption>
+IntelliReefs modular artificial reef structures made with Oceanite material [(IntelliReefs)]
+</caption>
 </figure>
 </WRAP>
-==== 2.4 Projects ====
-For our project involving a marine habitat at a maximum depth of 50 m off the Portuguese coast, the materials must withstand a pressure of approximately 5 bar while fostering biological growth and protecting sensitive sensors. To ensure the highest level of efficiency and environmental compatibility, we have analyzed various materials used in international restoration efforts.
-The selection of materials and the structural design of artificial habitats are fundamental to ensuring both environmental compatibility and long-term viability. For this project, concrete has been identified as the primary material due to its exceptional durability and its proven track record in underwater construction. Its capacity to provide structural integrity against significant environmental stressors—such as salinity, strong currents, and wave action—makes it the industry standard for creating resilient marine foundations. While the chemical properties of concrete, particularly its initial pH levels, have historically been a point of debate, recent research has shifted the focus toward a more nuanced understanding of its behavior in open marine environments [(KNOESTER2024)].
-Studies indicate that the high alkalinity of newly submerged concrete (typically between 12–14) is rapidly diluted by seawater, resulting in no significant long-term detriment to coral growth or benthic colonization [(KNOESTER2024)]. This suggests that ecological success depends less on extended curing periods or pH-neutral mixtures and more on the physical attributes of the habitat. Consequently, the following sections will detail how our project prioritizes structural complexity, substrate durability, and hydrodynamic stability [(NewHeaven2016)]. By optimizing the weight-to-complexity ratio and ensuring low water absorption, we can guarantee that these structures remain stationary during extreme weather events while providing the necessary niches for biodiversity to thrive [(KNOESTER2024)].
+==== 2.5 Materials ====
+For this project involving a marine habitat at a maximum depth of 50 m off the Portuguese coast, the materials must withstand a pressure of approximately 5 bar while fostering biological growth and protecting sensitive sensors. To ensure the highest level of efficiency and environmental compatibility, various materials used in international restoration efforts has been analyzed.
-Based on the research and articles reviewed, the following table evaluates different material options—ranging from traditional foundations to innovative biocompatible substrates—from which we will select the most suitable components for our specific implementation:
+The selection of materials and the structural design of artificial habitats are fundamental to ensuring both environmental compatibility and long-term viability. For this project, concrete has been identified as the primary material due to its exceptional durability and its proven track record in underwater construction. Its capacity to provide structural integrity against significant environmental stressors—such as salinity, strong currents, and wave action—makes it the industry standard for creating resilient marine foundations. While the chemical properties of concrete, particularly its initial pH levels, have historically been a point of debate, recent research has shifted the focus toward a more nuanced understanding of its behavior in open marine environments [(KNOESTER2024)].
-=== 2.4.1. Structural Materials ===
+Studies indicate that the high alkalinity of newly submerged concrete (typically between 12–14) is rapidly diluted by seawater, resulting in no significant long-term detriment to coral growth or benthic colonization [(KNOESTER2024)]. This suggests that ecological success depends less on extended curing periods or pH-neutral mixtures and more on the physical attributes of the habitat. Consequently, the following sections will detail how this project prioritizes structural complexity, substrate durability, and hydrodynamic stability [(NewHeaven2016)]. By optimizing the weight-to-complexity ratio and ensuring low water absorption, it can be guaranteed that these structures remain stationary during extreme weather events while providing the necessary niches for biodiversity to thrive [(KNOESTER2024)].
+Based on the research and articles reviewed, the following subsection evaluates different material options—ranging from traditional foundations to innovative biocompatible substrates—from which the selection for the most suitable components will be done for this specific implementation.
+=== 2.5.1. Structural Materials ===
 **A. Bacterial (Self-healing) High-Strength Concrete (HSC)**
 This material incorporates bacterial spores, specifically *Bacillus sphaericus* (strain ATCC 14577), which remain dormant until a crack occurs. Water ingress activates the bacteria, which then precipitate calcium carbonate to seal the crack [(ALYAARI2026)].
@@ Line 111: / Line 159: @@
 **E. Recycled Glass (Partial Aggregate Replacement)**
-Crushed waste glass used to replace up to 30% of fine aggregates in the concrete mix [(DAAROL2026)].
+Crushed waste glass used to replace up to 30 % of fine aggregates in the concrete mix [(DAAROL2026)].
   * **Pros:** Improves **chemical resistance** and reduces water absorption [(DAAROL2026)]. It offers an eco-friendly way to utilize waste while maintaining sufficient compressive strength for marine applications [(DAAROL2026)].
-  * **Cons:** Replacing more than 30% of aggregate leads to a **significant reduction in compressive strength** [(DAAROL2026)].
+  * **Cons:** Replacing more than 30 % of aggregate leads to a **significant reduction in compressive strength** [(DAAROL2026)].
   * **Price:** Estimated at **90 €/m<sup>3</sup> – 140 €/m<sup>3</sup>**.
 **F. Biorock (Mineral Accretion)**
@@ Line 122: / Line 171: @@
   * **Price:** Base infrastructure **120 €/m<sup>3</sup> – 160 €/m<sup>3</sup>** (excluding electrical components).
----
+== 2.5.1.1 Summary Table ==
-== 2.4.1.1 Summary Table ==
+The previous subsection regarding the materials evaluated for the project, is sumarized in Table {{ref>tab:summary}}.
-<color #ed1c24>Table {{ref>tab:summary}} ...</color>
+<WRAP>
 <table tab:summary>
-<caption><color #ed1c24>Add caption</color></caption>
+<caption> Summary table for materials evaluated </caption>
-| Material | Primary Requisite Met | Pros | Cons | Price (est. / $m^3$) |
+| Material | Primary Requisite Met | Pros | Cons | Estimated Price / m<sup>3</sup> |
-| **Bacterial HSC** | Longevity/Pressure | Autonomous repair; 96% watertight | High complexity | €180–€260 |
+| **Bacterial HSC** | Longevity/Pressure | Autonomous repair; 96 % watertight | High complexity | 180–260 € |
-| **Basalt Reinforcement** | Corrosion Resistance | Non-corrosive; volcanic origin | Lower flexural peak | €160–€220 |
+| **Basalt Reinforcement** | Corrosion Resistance | Non-corrosive; volcanic origin | Lower flexural peak | 160–220 € |
-| **ECOncrete®** | Sea-life Friendly | Neutral pH; bioprotection | Specific mix needs | €140–€180 |
+| **ECOncrete®** | Sea-life Friendly | Neutral pH; bioprotection | Specific mix needs | 140–180 € |
-| **Recycled Glass** | Sustainability | Increased chemical resistance | Strength loss >30% | €90–€140 |
+| **Recycled Glass** | Sustainability | Increased chemical resistance | Strength loss > 30 % | 90–140 € |
-| **Biorock** | Life Promotion | 4:1 growth; self-repairing  | Power dependent | €120–€160 |
+| **Biorock** | Life Promotion | 4:1 growth; self-repairing  | Power dependent | 120–160 €|
 </table>
+</WRAP>
+== 2.5.1.2 Materials for Prototype vs. Final ==
-==  2.4.1.2 Materials for Prototype vs. Final ==
 Here we have another issue, since we have to present a prototype where it has to be functional and pass some test previously mentioned, we need to select a material with similar characteristics to the actual model, in order to be as close as possible. But also that is easy to get and handle since we are gonna be the ones using it.
-__//**TO BE CHECKED**//__
+<color #6aa84f>__//**TO BE CHECKED WHEN THE PROTOTYPE HAS TO BE DONE**//__</color>
 - Option 1 : Basalt fabric-reinforced is attached to abandoned concrete or industrial waste. We need to check the pH level is neutral this process.
@@ Line 150: / Line 203: @@
   * **cons** There are size limitations depending on the oven and it is different from the model of actual project so not sure if it will approve.
-=== 2.4.2 Sensor placements ===
+=== 2.5.2 Sensor placements ===
-Designing a successful marine habitat involves a delicate technical paradox. On one hand, the project’s primary objective is to encourage biological colonization and the growth of marine life; on the other, the integrated sensors require direct, unobstructed contact with seawater to maintain accuracy. This necessity creates a significant challenge, as the very "bio-friendly" environment we aim to foster can lead to marine biofouling on sensitive equipment, which critically compromises data reliability and sensor sensitivity [(SAHOO2025)].
+Designing a successful marine habitat involves a delicate technical paradox. On one hand, the project’s primary objective is to encourage biological colonization and the growth of marine life; on the other, the integrated sensors require direct, unobstructed contact with seawater to maintain accuracy. This necessity creates a significant challenge, as the very "bio-friendly" environment the team aims to foster can lead to marine biofouling on sensitive equipment, which critically compromises data reliability and sensor sensitivity [(SAHOO2025)].
-To resolve this conflict, our strategy focuses on three integrated design pillars. First, we must carefully select housing materials that support structural life while shielding internal components. Second, we are evaluating specialized anti-fouling coatings that can prevent accumulation on sensor windows without leaching harmful chemicals into the surrounding habitat. Finally, the spatial distribution of the sensors must be strategically planned to allow for clear measurements while minimizing their exposure to rapid biological growth. This balanced approach ensures that our ecological goals do not come at the expense of long-term monitoring precision.
+To resolve this conflict, the strategy focuses on three integrated design pillars. First, a carefully selection of housing materials that support structural life while shielding internal components must  be done. Second, evaluating specialized anti-fouling coatings that can prevent accumulation on sensor windows without leaching harmful chemicals into the surrounding habitat. Finally, the spatial distribution of the sensors must be strategically planned to allow for clear measurements while minimizing their exposure to rapid biological growth. This balanced approach ensures that the ecological goals do not come at the expense of long-term monitoring precision.
-== 2.4.2.1 Materials for Housing ==
+== 2.5.2.1 Materials for Housing ==
-**Titanium alloy (TC4)** or **316 L stainless steel** are recommended for pressure resistance and durability [(SAHOO2025)]. For a 200 m depth, **Titanium** is preferred for long-term corrosion resistance [(evologics)].
-== 2.4.2.2 Antifouling Coatings ==
+The housing material must protect the internal electronics from high pressure and corrosion while maintaining long-term durability in seawater environments.
-    *   **PDMS (Polydimethylsiloxane):** A non-toxic, "fouling-release" coating that reduces the adhesion of algae and barnacles [(SAHOO2025)].
-    *   **CPT (Camptothecin)-based Paint:** A natural compound that has shown virtually no macrofouling after nine months of immersion [(SAHOO2025)].
-    *   **SLIPS (Slippery Liquid-Infused Porous Surfaces):** These provide exceptional resistance to organism attachment even in stagnant water [(SAHOO2025)].
+**Titanium alloy (TC4)** or **316 L stainless steel** are recommended for pressure resistance and durability [(SAHOO2025)]. For more than 200 m depth, **Titanium** is preferred for long-term corrosion resistance [(evologics)].
+== 2.5.2.2 Antifouling Coatings ==
+Even with durable housing materials, marine organisms may attach to exposed surfaces over time. For this reason, antifouling coatings are considered to reduce biological growth on sensors and maintain measurement accuracy.
+  *   **PDMS (Polydimethylsiloxane):** A non-toxic, "fouling-release" coating that reduces the adhesion of algae and barnacles [(SAHOO2025)].
+  *   **CPT (Camptothecin)-based Paint:** A natural compound that has shown virtually no macrofouling after nine months of immersion [(SAHOO2025)].
+  *   **SLIPS (Slippery Liquid-Infused Porous Surfaces):** These provide exceptional resistance to organism attachment even in stagnant water [(SAHOO2025)].
-=== 2.4.3 Biologic and geographical analysis ===
-**Fish structure**
-Fish populations are generally associated with habitats that exhibit high structural complexity and spatial heterogeneity. Research suggests that complex environments provide essential ecological resources necessary for survival, including food availability, shelter from predators, and suitable areas for reproduction [(Graham2013)]. Structural features such as crevices, cavities, and irregular surfaces may create microhabitats that support a greater diversity of marine organisms and increase the overall ecological value of reef systems [(Graham2013)].
-Artificial and natural reefs typically contain irregularities and indentations that form small shelters or “nooks”, which can serve as refuge areas for fish and other marine organisms [(Graham2013)]. These structural features are believed to reduce predation risk and provide protected spaces where fish can rest or reproduce.
-Studies also indicate that fish communities tend to perform better in connected habitat mosaics rather than isolated structures [(Graham2013)]. Networks of habitats may facilitate movement, feeding opportunities, and ecological interactions between species, which can contribute to more stable and diverse marine ecosystems [(Graham2013)].
+=== 2.5.3 Biologic and geographical analysis ===
-**Location**
+**Fish structure**
-The location of artificial reefs plays a key role in determining their effectiveness. The chosen site should encourage marine life to settle while avoiding interference with human activities such as shipping routes or commercial fishing areas. Water depth is another important consideration. Reefs placed too deep may not receive enough sunlight to support the growth of marine plants like algae, whereas reefs that are too shallow can be more vulnerable to damage from storms or human activity [(PHAROS2024)].
+Fish populations are generally associated with habitats that exhibit high structural complexity and spatial heterogeneity [(Graham2013)]. Research suggests that complex environments provide essential ecological resources necessary for survival, including food availability, shelter from predators, and suitable areas for reproduction. Structural features such as crevices, cavities, and irregular surfaces may create microhabitats that support a greater diversity of marine organisms and increase the overall ecological value of reef systems.
-Most of the Artificial reef projects are placed at the depth of 10-30m but it all depends on which species and what type of marine life you are aiming the reefs for (see table {{ref>tab_label1}}).
+Artificial and natural reefs typically contain irregularities and indentations that form small shelters or “nooks”, which can serve as refuge areas for fish and other marine organisms. These structural features are believed to reduce predation risk and provide protected spaces where fish can rest or reproduce.
+Studies also indicate that fish communities tend to perform better in connected habitat mosaics rather than isolated structures [(Graham2013)]. Networks of habitats may facilitate movement, feeding opportunities, and ecological interactions between species, which can contribute to more stable and diverse marine ecosystems.
+**Location**
+The location of artificial reefs plays a key role in determining their effectiveness. The chosen site should encourage marine life to settle while avoiding interference with human activities such as shipping routes or commercial fishing areas. Water depth is another important consideration. Reefs placed too deep may not receive enough sunlight to support the growth of marine plants like algae, whereas reefs that are too shallow can be more vulnerable to damage from storms or human activity [(PHAROS2024)].
+Most of the artificial reef projects are placed at the depth of 10-20 meters, but it all depends on which species and what type of marine life are the reefs intended for.
-==== 2.5 Comparative Analysis ====
-The selected solutions were evaluated based on criteria such as cost, monitoring capability, structural complexity, sustainability, durability, and ecological performance.
-<table tab_label1>
-<caption> State of the art comparative analysis </caption>
-^ Criteria ^ MEITEC ^ ECOncrete ^ IntelliReefs ^
-| Cost | Medium | High | Medium–High |
-| Real-time Monitoring | No | No | No |
-| Data Transmission | No | No | No |
-| Structural Complexity | Low–Medium | Medium | High |
-| Sustainability | Medium | High | High |
-| Durability (Corrosion Resistance) | High | High | Medium |
-| Ecological Performance | Medium | High | High |
-| Material Type | Conventional concrete | Eco-enhanced concrete | Alternative eco-materials |
-| Modularity | Low | Medium | High |
-| Scalability | High | Medium | Medium |
-| Maintenance Requirements | Low | Low–Medium | Medium |
-| Data-driven Decision Support | No | No | No |
-| Innovation Level | Low | Medium | Medium–High |
-</table>
-==== 2.6 Summary ====
-//Provide here the conclusions of this chapter and make the bridge to the next chapter.//
-<del>Based on this study of the state of the art, the team decided to adopt the following <specify here the architecture, technique(s), material(s), component(s)> because <specify here the technical/scientific reasons>.
-</del>
-The comparison indicates that current artificial reef solutions primarily focus on structural and ecological aspects. Solutions such as ECOncrete and IntelliReefs demonstrate strong performance in sustainability and ecological enhancement, while MEITEC emphasizes structural stability and durability.
-However, none of the analyzed solutions incorporate real-time monitoring or data transmission capabilities. This represents a significant limitation, as the effectiveness of marine restoration projects cannot be easily measured or optimized without continuous environmental data.
-In addition, while modularity and structural complexity vary among solutions, scalability and long-term adaptability remain key challenges in existing systems.
-Based on this analysis, it was observed that existing solutions provide valuable approaches to habitat design and ecological enhancement, but lack integration with data-driven technologies. These observations served as both a limitation and a source of inspiration for the proposed project.
-The design direction was therefore developed to combine the strengths of current solutions—such as sustainability, structural performance, and ecological support—while addressing their limitations through the integration of real-time monitoring and data collection capabilities.