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Image copyright John Angerson. <br />
STS-72 mission training.<br />
Dive crew member from Neutral Buoyancy Laboratory (NBL) seen through a large magnifier that was used to observe Astronauts while they undertook neutral-buoyancy diving training,12-meters below the surface of the pool. <br />
Neutral Buoyancy Laboratory (NBL). Johnson Space Center in Houston, Texas.