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The Neutral Buoyancy Laboratory at NASA Johnson Space Center in Houston, Texas. (NBL) is an astronaut training facility and neutral buoyancy pool that makes up part of the Sonny Carter Training Facility. The NBL is a large pool that is 40 feet deep (20 feet underground and 20 feet aboveground), 202 ft. long, and 102 ft. wide containing 6.2 million gallons of water. Its primary purpose is to train astronauts for EVA by simulating micro-gravity conditions.