JSC2009-E-061387 (23 March 2009) --- NASA astronaut John ?Danny? Olivas and European Space Agency (ESA) astronaut Christer Fuglesang (partially obscured), both STS-128 mission specialists, attired in training versions of their Extravehicular Mobility Unit (EMU) spacesuit, are about to be submerged in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center. 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.