Dure Limite: Caving in a mill, Mer de Glace

The Mer de Glace in Chamonix, November 86: every summer the meltwater that runs on the surface of the glacier flows into a huge crevasse called "a mill". In 1897, Joseph VALLOT had explored it to a depth of 60m, a lake had prevented him from going any further. Since then no one had descended into this well.