Stock Photo - Wearing a training version of the shuttle extravehicular mobility unit (EMU) space suit, astronaut Joseph R. Tanner, STS-97 mission specialist, is surrounded by a support team of SCUBA-equipped divers underwater in the giant Neutral Buoyancy Laboratory (NBL). Tanner was there, along with astronaut Carlos I. Noriega, to rehearse one of three scheduled space walks to make additions to the International Space Station (ISS). The five-man crew in early December will deliver the P6 Integrated Truss Segment, which includes the first US Solar arrays and a power distribution system.