
thumb|Cavers in the Hölloch The Hölloch () is a long cave in the municipality Muotathal in Switzerland. In addition to being the third longest cave in Europe and the 11th longest of the world, it is also notable for having a depth of . The Hölloch is an example of a karst cave system.
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thumb|Cavers in the Hölloch The Hölloch () is a long cave in the municipality Muotathal in Switzerland. In addition to being the third longest cave in Europe and the 11th longest of the world, it is also notable for having a depth of . The Hölloch is an example of a karst cave system.
== Exploration == The cave was first scientifically explored in 1875 by a group led by Alois Ulrich. Later expeditions in the 1950s by Alfred Bögli, one of the pioneers of speleology, managed to explore a large part of the cave.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).