French engineers are set to drain a lake that has formed under a glacier on Mont Blanc and threatens to flood the St Gervais valley. The lake, which is said to contain 65,000 cubic metres of water, was discovered last month during routine checks. Experts are worried that the pressure of the water, combined with possible warmer temperatures, could cause sudden fractures in the ice resulting in flash flooding. In 1892 water from an underground lake flooded the Saint Gervais valley killing 175 people. Read more
