This cutaway diagram of the Airlock for the International Space Station shows the key elements for this gateway to space. Included is the Equipment Lock where the space suits are stored and the Crew Lock, from which the astronauts will exit and enter the International Space Station. Built by Boeing, the Airlock is made of aluminum. It is 18 feet long (5.5 meters), 13 feet in diameter (4) meters, and weighs 13,368 pounds (6,064 kilograms)