S98-00157 --- A mock-up of TransHab, the large-volume inflatable space vehicle, is seen during 1998 testing at the Johnson Space Center’s Space Environment Simulation Laboratory (SESL). SESL houses the giant Chamber A, the door of which has a 40-foot diameter and weight of 40 tons. TransHab, the large-volume inflatable space vehicle, was a proposed design for a habitation element for lengthy space missions. It is not part of NASA’s current plans. Photo credit: NASA or National Aeronautics and Space Administration