Today, maritime infrastructures (MI), such as dikes, jetties, quays, groins, anchorages, omnipresent on the Channel coast, are neither designed nor built with the objective of improving and protecting coastal and transitional water ecosystems, but only to serve human activities: transport, fishing, coastal development and protection, pleasure boating, tourism. On the contrary, MIs replace rich coastal ecosystems with artificial areas that are poor in biodiversity. To avoid these negative effects and create MIs that improve the ecological state of the coasts, it is necessary to support project managers and engineers towards a new method of designing MIs. Starting with an environmental analysis, the designer directs his strategy according to the needs of the site: the protection of a locally occurring threatened species or the overall improvement of a site with common ecological characteristics. The creation of easier to use indicators and a global assessment method (in accordance with the Strategic Framework Directive on the Marine Environment – SMFD) will provide professionals with the necessary tools for this analysis. Then, through pilot operations (POs) in real environment (FR and UK), the project will provide technical solutions for both strategic lines of action (WP T1 for the protection of a targeted species and WP T2 for the overall improvement of biodiversity). The innovation, which consists in directly integrating habitats for marine organisms into IMs, will be made possible by adapting commonly used materials (concretes) to precise ecological specifications. Biomimetic MIs will be deployed on 2 large-scale POs and 6 experimental sites (ES) to test different types of MI and ensure transferability throughout the F(M)A area. The improvements made by these MIs will be measured according to the CMMSD descriptors (measurement of biomass, biodiversity, abundance of fish resources and eutrophication; monitoring of invasive species and analysis of food webs). The project aims to achieve an overall improvement of at least 15% in all these indicators compared to the existing situation. The economic profitability of biomimetic IM is ensured by working with materials and construction techniques known to guarantee negligible additional costs (<5%) compared to existing technologies. We will accelerate the market launch of our solutions by creating training courses (MT T3) and business models for clients, prime contractors and companies.