The Sonny Carter Training Facility is a set of buildings north of Johnson Space Center in Houston, Texas. It is primarily known as the location of the Neutral Buoyancy Laboratory. An aerial view of the complete Johnson Space Center facility in Houston, Texas in 1989. ... Houston redirects here. ... Official language(s) English (de facto) See also languages of Texas Capital Austin Largest city Houston Area  Ranked 2nd  - Total 261,797 sq mi (261,797 km²)  - Width 773 miles (1,244 km)  - Length 790 miles (1,270 km)  - % water 2. ... An astronaut training in the NBL The Neutral Buoyancy Laboratory or NBL is a training facility for astronauts maintained by NASAs Johnson Space Center in Houston, Texas. ...