Hölloch Cave

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Hölloch Cave is a 194km long cave situated between the river Muota and the area of the Pragelpass in the Valley of Muotha in Switzerland. It is also notable for having a depth of 939m. The initial exploration started in 1875 and was led by Alois Ulrich. A large part of the exploration of this cave was led by Alfred Bogli. The explored length of the cave increased from 25km in 1952 to 100km in 1968 (it was the first cave in the world where the explored length reached 100km.) Until 1970, it was thought to be the largest cave complex in the world, this title now thought to be held by Mammoth Cave National Park.