A pressure suit is customarily required at around 15,000 m for a well conditioned and experienced pilot to safely operate an aircraft in unpressurized cabins.
This was a reusable laboratory consisting of multiple components, including a pressurized module, an unpressurized carrier, and other related hardware.
Other technology for the base design include a meteorological balloon, unpressurized rover, storage/work area, an area for geophysical experiments, and an area antenna.