Reefy is a young and innovative start-up focused on nature-based solutions. We strive to make a positive impact on vulnerable coastal cities and improving life under the sea. We are developing “lego-like” blocks that can be assembled to form an underwater artificial reef structure. This structure has different levels of complexity to host a flourishing reef ecosystem for both cold and tropical environments. At the same time, the structure creates a customizable barrier of any size that can dissipate wave energy and protect vulnerable coastlines from erosion and flooding.