The Sub-Surface habitat with its big windows and a futurist lens or disc shape is a option for housing on open water due to its invulnerability to bad weather which differs it from surface float concepts. It has a potential as well as private island and living space as for tourist purpose with use as a underwater observatory or as futurist submarine bar for the ultimate nightlife in touristic areas. Deck space is big enough to host a beach party but designed to have little wind and wave resistance during stormy weather. So living on open sea in a structure that will not move in waves becomes available for relatively small Habitats. The Habitat is meant to be single level that will be flooded by light and contain big window areas.