Abstract: A complete design for a submergible cabin is submitted, which provides commodities and standards required for housing 8 people with absolute commodity and safety under the water for an indefinite period of time. The infrastructure for life support is located at the coast and the supplies are driven through pipelines anchored to the sea bottom. The level of water in the lower access, which works under the upside down cup principle, is controlled by redundant level sensors, which in turn allow access of fresh air to the cabin, sending to the coast part of the used air in order to not recycle the same air and evacuate bad smell, CO2 and heat from air conditioner and refrigerator units. The design of the shells and the structure allows its transportation in standard containers and then assembly at the dock, close to the installation place. The total construction from ceiling to floor is carried out with only 3 small forms due to the design is done with repeating pieces in order to reduce costs.