JSC2007-E-46551 (18 Sept. 2007) --- Astronauts Daniel M. Tani, Expedition 16 flight engineer; and Scott E. Parazynski (partially obscured), STS-120 mission specialist, are about to be submerged in the waters of the Neutral Buoyancy Laboratory (NBL) near Johnson Space Center. Tani and Parazynski are attired in training versions of their Extravehicular Mobility Unit (EMU) spacesuit. SCUBA-equipped divers (out of frame) 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. Tani is scheduled to join Expedition 16 after launching to the station on mission STS-120.