A team of climbers on an expedition to drop 50,000 US dollars of cryptocurrency at the top of Mt. Qomolangma were rescued by helicopter after they got stuck there with no oxygen. /VCG Photo

Four adventurers trekked 8,848m to the summit of the world's tallest mountain as part of a stunt arranged by social network ASK.fm. /VCG Photo

Once they reached the peak they left 500,000 ASKT tokens, which is equivalent to 50,000 US dollars, buried in the snow for another thrill-seeker. But as they made their descent they were forced to call for help after two members of the Ukrainian party got stuck above 7,000 meters high with no oxygen in freezing temperatures. /VCG Photo