Final space shuttle crew training session in the NBL

JSC2011-E-054053 (13 June 2011) --- NASA astronaut Rex Walheim, STS-135 mission specialist, gets help donning a training version of his Extravehicular Mobility Unit (EMU) spacesuit in preparation for a spacewalk training session in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center. Photo credit: NASA