STS-116 crew members during EVA training at the NBL.

JSC2006-E-46477 (25 Oct. 2006) --- Astronauts Sunita L. Williams, Expedition 14 flight engineer, and Robert L. Curbeam (partially obscured), STS-116 mission specialist, are about to be submerged in the waters of the Neutral Buoyancy Laboratory (NBL) near Johnson Space Center. Williams and Curbeam are attired in training versions of the Extravehicular Mobility Unit (EMU) spacesuit. SCUBA-equipped divers are in the water to assist the crewmembers in their rehearsal, intended to help prepare them for work on the exterior of the International Space Station.