Astronaut Bruce McCandless II (on the left) and Mission Specialist Kathryn Sullivan practice EVA procedures for the deployment of the Hubble Space Telescope. The underwater tank at Johnson Space Center allows astronauts to practice procedures in an environment similar to weightlessness. The divers ensure the astronauts do not entangle their air hoses, but they do not assist the astronauts in their actual tasks. Although the mission plan did not call for an EVA, the astronauts practiced just in case something went wrong in the deployment. Fortunately, the deployment went smoothly and the astronauts did not have to leave the Shuttle.
NASA Photo ID: S90-30524
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