The Trummelbach Falls (In German: Trümmelbachfälle) in Switzerland are a series of ten glacier-waterfalls inside the mountain made accessible by tunnel-lift and illuminated.
The Trummelbach alone drains the mighty glacier defiles of Eiger (3970 m), Mönch (4099 m) and Jungfrau (4158 m) and carries 20,200 tons of boulder detritus per year.
Its drainage area is 24 km2, half of it covered by snow and glaciers. Up to 20,000 liters of water per second. The only glacier-waterfalls in Europe inside the mountain and still accessible.