How can we treat the sea as a new topography? This master thesis, through the exploration of the current state of the Gulf of Elefsis, attempts, through hypotheses, appeals and actions, to reactivate part of the total activity and productivity of the area of the gulf, through the installation of multiple structures on the sea. These are intended to make the inhabitants return to the previously harmful marine environment of the area, and to exploit the sea for their benefit through alternative ways of producing food, energy and tourism. These structures were designed with the logic of the module, that is multiplied in order to be variable in use and also to receive different artificial grounds, depending on the area's need. They are located either at locations where many kinds of problems are encountered in an attempt to overturn them, either at historical, architectural and naval points of interest, or near areas which will probably be affected from rising sea levels in the years to come. The overall approach focuses on the user's immediate contact with water during his stay at the artificial ground, in order to confront the strong enforcement that water creates when it encircles an urban use from all its’ sides and separates it from the steady land.