S94-39771 (August 1994) --- Astronaut Mark C. Lee is pictured prior to the mission specialist's participation in an underwater rehearsal for an extravehicular activity (EVA). Lee's spacewalk is scheduled for the September STS-64 mission. New rescue gear for use on future space shuttle missions will be evaluated during the mission's single spacewalk, involving astronauts Lee and Carl J. Meade, mission specialist. Photo credit: NASA or National Aeronautics and Space Administration