A huge, unstable chunk of glacier is blocking the route up Mount Everest from Base Camp in Nepal just as peak climbing season gets underway in the Himalayas. 'Icefall doctors' – who fix ropes and ladders on the lower part of the route up the world's highest peak - can find no way around the 100-foot-high (30m) block of ice just under Camp 1. They say the only option is to wait for the ice block, called a serac, to melt – which they hope will happen within days. This delay means preparations are weeks behind schedule for the spring season when weather for Everest ascents is usually optimal, raising concerns that climbers will be queuing to reach the summit again this year. Purnima Shrestha, a prominent climber and photographer from Nepal, is currently acclimatizing to summit Everest for the sixth time. She highlighted that the delays have added fears of potential traffic jams on the peak this year. Sherpas and the tourism department are exploring options, including airlifting teams to higher camps, while waiting for the ice to melt.