Trainees wear suits designed to provide neutral buoyancy to simulate the microgravity that astronauts would experience during spaceflight. In the late 1980s NASA began to consider replacing its previous neutral-buoyancy training facility, the This new pool was going to be on Johnson Space Center property and was planned to be 72 meters (235 ft) by 41 meters (135 ft), with a depth of 18 meters (60 ft). The NBL's main feature is a large indoor pool of water, in which astronauts may perform simulated EVA tasks in preparation for upcoming missions. The Neutral Buoyancy Laboratory is an astronaut training facility and neutral buoyancy pool operated by NASA and located at the Sonny Carter Training Facility, near the Johnson Space Center in Houston, Texas. NASA purchased the structure that now holds the NBL from The diving tank is 202 feet (62 m) in length, 102 feet (31 m) wide, and 40 feet 6 inches (12.34 m) deep, and contains 6.2 million gallons (23.5 million litres) of water.During training exercises, neutral-buoyancy diving is used to simulate the One disadvantage of neutral-buoyancy diving as a simulation of microgravity is the significant amount of Another downside of neutral buoyancy simulation is that astronauts are not weightless To save money it was downsized and placed inside an existing structure.