Wearing a training version of the Space Shuttle Extravehicular Mobility Unit, astronaut Jeffrey A. Hoffman uses the giant pool of the Johnson Space Center's Weightless Environment Training Facility (WET-F) to rehearse for the Hubble Space Telescope's Servicing Mission 1. The hand at left belongs to a SCUBA-equipped diver. A number of divers were on hand for all training sessions in the WET-F.
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