S97-00588 (8 Jan 1997) --- In the new Neutral Buoyancy Laboratory (NBL) at the Sonny Carter Training Center Facility, astronaut Mark C. Lee (obscured by bubbles at center) and an instructor practice procedures to be used during four scheduled space walks to service the Hubble Space Telescope (HST). At present, four sessions of Extravehicular Activity (EVA), are planned, using two pairs of astronauts on alternating days. Lee, payload commander, will work with Steven L. Smith, while Gregory J. Harbaugh will team with Joseph R. Tanner. Astronaut Jeffrey A. Hoffman (wearing space suit, center frame) who performed three EVA?s on the initial HST-servicing mission, helped to train the astronauts.