Marco Siffredi was a french mountaineer and snowboarder who disappears on a mountain, specifically when attempting to snowboard down mount Everest.

He rose to fame in extreme sports because of his daring nature and can-do attitude on mountains.

Siffredi's snowboard attempt of Mount Everest was a pivotal moment for snowboarders and secured Siffredi a title in the history books.

Marco Siffredi vanished on an expedition and speculation surrounds his whereabouts today.

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