The large vacuum chamber in the Space Environment Simulation Laboratory (SESL), Chamber A, is a large stainless steel vessel, 65' in diameter by 120' high. The door is 55' in diameter. Inside clear dimensions are 55' diameter by a height of 90'. The chamber is used to simulate a lunar environment. Temperate can be controlled to simulate lunar surface temperatures from -315 to +260 degrees Fahrenheit. A scale model of the Apollo capsule awaits testing.