JSC2011-E-029084 (21 March 2011) --- NASA astronauts Chris Ferguson (right), STS-135 commander; Sandy Magnus (second right), mission specialist; and Doug Hurley, pilot, participate in a training session in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center. Crew instructors assisted the crew members. STS-135 is planned to be the final mission of the space shuttle program. Photo credit: NASA or National Aeronautics and Space Administration
Photographer ROBERT MARKOWITZ
Date March 21, 2011