A policeman has come one step closer to becoming the first person to climb the highest peaks on all seven continents while representing Hong Kong. Mark Duncan, 33, a police inspector, recently returned to Hong Kong after scaling Alaska's Mount McKinley in May. This brings to four the number of peaks conquered by the long-time Hong Kong resident in his attempt to raise money for Cambodian landmine victims. Since he began his quest last year, he has climbed Tanzania's Mount Kilimanjaro, Russia's Mount Elbrus and Australia's Mount Kosciusko. He braved harrowing winds, freezing temperatures, and sometimes near-zero visibility to arrive at the top of Mount McKinley on May 26, reaching an altitude of 6,194 metres. The mountain is regarded as being more difficult to climb than Mount Everest - the world's highest peak. 'All you can do is kneel down, get your axe into the ice and hope to God you don't get blown off the mountain,' he said. Disaster nearly struck at one point at a place nicknamed Windy Corner, when he fell into a crevasse. 'I couldn't see anything and I was just walking along, and the next thing I knew I was up to my waist in snow, and couldn't feel any ground beneath my feet,' he said. 'It was pretty hair-raising but I managed to get out because [my teammates and I] were roped together.' The adventurer said he now plans to begin an assault on Mount Vinsom in Antarctica and South America's Mount Aconcagua in November - before completing his bid by climbing Mount Everest. The bid is being made with the blessings of the government's Information Services Department. His quest to climb the highest peaks on all seven continents to raise money for Cambodia's National Disabled Volleyball Programme has been showcased on an RTHK documentary, Climbing for Cambodia.