NASA astronaut Terry Virts simulates extravehicular activity in the Johnson Space Center's Neutral Buoyancy Laboratory.
NASA astronaut Terry Virts simulates extravehicular activity in the Johnson Space Center’s Neutral Buoyancy Laboratory. His session was to evaluate proper procedures and techniques in support of a possible spacewalk by two astronauts on the International Space Station to trouble-shoot an ammonia leak issue. A number of SCUBA-equipped divers were in the water to assist the astronauts.