JSC2002-E-27065 (1 July 2002) --- Astronauts David A. Wolf and Piers J. Sellers (partially obscured), both STS-112 mission specialists, are about to be submerged in the waters of the Neutral Buoyancy Laboratory (NBL) near the Johnson Space Center (JSC). Wolf and Sellers are wearing the training version of the Extravehicular Mobility Unit (EMU) space suit. Scuba divers are in the water to assist the astronauts in their rehearsal, intended to help prepare them for work on the exterior of the International Space Station (ISS).