The ten glacier waterfalls inside the mountain here, which are made accessible by a tunnel lift, make the Trümmelbach waterfalls unique. They are the largest underground waterfalls in Europe. The power of the water and the deafening noise here will astound you. The Trümmelbach drains the huge glacier walls of the Eiger, Mönch and Jungfrau at a rate of up to 20,000 litres of water per second.