The B330 (previously known as the Nautilus space complex module and BA 330) was an inflatable space habitat being privately developed by Bigelow Aerospace from 2010 until 2020. The design was evolved from NASA's TransHab habitat concept. B330 will have of internal volume, hence its numeric designation. The craft is intended to support zero-gravity research including scientific missions and manufacturing processes. Beyond its industrial and scientific purposes, however, it has potential as a destination for space tourism and a craft for missions destined for the Moon and Mars. Several test articles were built and tested in various conditions in ground test facilities, but no flight versions were built. Features Compared to their volume-mass ratio, expandable modules offer more living space than traditional rigid modules. For example, the pressurised volume of a B330 module is , compared to of the 15-tonne ISS Destiny module. Thus B330 offers 210% more habitable space, with an increase in mass of only 53%. Bigelow also claims that the module provides radiation protection equivalent to, and ballistic protection superior to, the International Space Station. The exterior of the craft is intended to be long by in diameter and the module will weigh at least . The habitat is designed to have two solar arrays and two thermal radiator arrays for heat dissipation, as well as life support systems to sustain a crew of up to six astronauts. It will also have "a zero-g toilet with solid and liquid waste collection, semi-private berths for each crew member, exercise equipment, a food storage and preparation station, lighting, and a personal hygiene station." The wall thickness will be approximately when the module is fully expanded. The walls are made up of 24 to 36 layers for ballistic protection, thermal protection, radiation protection and will be as hard as concrete once the craft is fully expanded. The exterior will also feature four large windows coated with a UV protection film. Dual-redundant control thruster systems are to be used, one using mono-propellant hydrazine and the other using gaseous hydrogen and gaseous oxygen. The latter system is refillable from the on-board environmental control system. Module-specific avionics will be provided for navigation, re-boost, docking, and other on-orbit maneuvering. Bigelow Aerospace is developing the B330 module to be compatible to mate with other spacecraft such as Russian Soyuz spacecraft, SpaceX's Dragon V2, Boeing's CST-100 Starliner, and NASA's Orion spacecraft. The module's large size is