Submersible
Any craft that can fully submerge in water as part of its design.
Submersible Autopropelled Habitat - European Submarine Structures AB - Submersible living space at a general cost of 331 Euro per cubic meter.
Concrete Shell Habitat, submersible autopropelled
Submersible Habitats make sense, as submerging is one of the easiest to perform measures to get a living space comfortable in big waves.
