In 2001 Marco Siffredi was the first person to snowboard down Everest. Siffredi’s plan was to snowboard down via the Hornbein Couloir, however when he reached the top of Everest he found that there was not enough snow to take the Hornbein Couloir route so instead me made the descent via the Norton Couloir. He survived. But Siffredi still wanted to make the descent down the Hornbein Couloir so he tried again the next year, this time in the fall when there would be more snow. Siffredi and the Sherpas he climbed with made it to the summit, but Siffredi was exhausted and possibly confused due to lack of oxygen. He took off on his board down the Hornbein Couloir, but that was the last anyone saw of him. His body was never recovered.