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Though no extravehicular activity is planned for STS-31, two crewmembers train for contingencies that would necessitate leaving their shirt sleeve environment of Discovery's cabin and performing chores with their Hubble Space Telescope payload or related hardware. Astronaut Kathryn D. Sullivan, mission specialist, is seen egressing the hatchway of the airlock of a full scale mockup of a Shuttle cabin to interface with an HST mockup in JSC's 25.-ft. deep pool in the weightless environment training facility (WET-F). Two SCUBA-equipped divers who assisted in the training session are also seen. Astronaut Bruce McCandless II, mission specialist, is out of frame.