![]() There are four observation levels with portholes to view activities within the simulator. The water within the simulator is temperature controlled, continuously recirculated and filtered. ![]() Within the heart of the simulator is a large water tank, 75 feet in diameter and 40 feet deep. Until the mid-1970s, when an additional facility was constructed at the Johnson Space Flight Center to support the Space Shuttle Program, this facility was the only test facility that allowed astronauts to become familiar with the dynamics of body motion under weightless conditions. Projects Gemini, Apollo, Skylab and the Space Shuttle have all benefited from the Neutral Buoyancy Simulator. Due to its capability to support research and testing of operational techniques and materials needed to successfully perform space-manned missions, the Neutral Buoyancy Simulator contributed significantly to the American manned space program. The Neutral Buoyancy Simulator is a facility that is unique within the National Aeronautics and Space Administration (NASA) inventory of training facilities. ![]() It was designed by the Army in 1955 to provide a simulated zero-gravity environment in which engineers, designers and astronauts could perform for extended periods of time in simulated environment of outer space. The Neutral Buoyancy Simulator is located in Building 4705 at the Marshall Space Flight Center in Huntsville, Alabama.
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