A group of mountaineers trekked to Mt Everest's so-called 'death zone' in order to perform a funeral for Slovenian alpinist Marko Lihteneker, who died in 2005 due to lack of oxygen. Climbers Oleg Savchenko, Alexander Sidyakin and Sergey Larin, assisted by local sherpas, took part in an expedition to give the deceased alpinist a proper burial. Their trek was called 'Everest 8300. Point of No Return', because 8,300 metres, or 27,231 foot above sea level is so high that light planes and helicopters are fly at that altitude.