Fifty years ago, on March 18th, 1965, Soviet Cosmonaut Alexei Leonov took the first spacewalk. It lasted just twelve minutes and almost ended in a disaster. That's because the vacuum of space caused his pressurized suit to inflate and become rigid, making it impossible for Leonov to re-enter the Voskhod 2 space capsule airlock. The quick thinking astronaut let out some of the precious air from his suit and despite severe decompression sickness, manage to stumble back in and live to tell his harrowing tale.