Principles for expanding a coastal town, for example MARSEILLE or CANNES, with methods for the prefabrication and construction of motor vehicle garage units, communication and underground lines and tall buildings. A dyke 1 delimits and protects the construction area 4 in which there are positioned, by flotation, stations 6, 7, 8 and lines for the underground 9, car parks 16 and 23, tall buildings 28 and 29, units prefabricated in a naval dockyard. IMAGE
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