What is marco siffredi?

Marco Siffredi (22 May 1979 – disappeared 8 September 2002) was a French snowboarder and alpinist known for his extreme descents.

His most famous achievement was the first successful snowboard descent of the Everest's Hornbein Couloir in 2001. He had previously attempted the descent in 1999 but had to turn back.

In 2002, Siffredi returned to Mount Everest with the goal of snowboarding down the Norton Couloir. He successfully summited on September 8, 2002, but disappeared during his descent. Despite extensive searches, his body was never recovered.