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About this place
Hölloch is a huge karst cave system in the municipality of Muotathal, canton of Schwyz, Switzerland, with its visitor base in the hamlet of Stalden. The surveyed passages run for more than 200 km, placing it among the longest caves in Europe and the world. A short section is open to ordinary visitors on guided tours, so you can sample this underground maze without caving experience.
What exactly is Hölloch?
It is a multi-level network of tunnels, fissures and large chambers carved into limestone by water. Published lengths range from roughly 197 km to over 211 km depending on survey date, and the system is deeper than 900 m. Explorers keep finding new passages, which is why the figures keep shifting.
Who found it?
Local mountain farmer Alois Ulrich is credited with the discovery: in 1875 he climbed in with a ladder and a lantern. From 1905 there were efforts to develop the cave commercially, and it opened to the public in 1906, but few visitors came. A flood in 1910 and lack of money ended further plans, and the cave was largely forgotten during the world wars. Systematic exploration took off in the 1950s, when the mapped length grew quickly.
How can you visit?
Entry is only possible with a guide. Tours start at the Hölloch Center on Stalden in Muotathal, and bookings go through the operator Trekking Team.
- Short guided tour: about two hours covering the first 700 m, in groups of up to 30 people.
- Beginner tour: around three hours through the developed part of the cave.
- Longer expeditions, such as the Hölloch Challenge (about six hours), involve crawling, climbing and good fitness; groups of six or more.
Children can join from age 9. Prices vary by season and tour, so check the current rates with the operator.
What should you bring?
The cave is cold, and the floor can be wet and slippery. Wear warm layers and shoes with good grip. A helmet and light are supplied as part of the tour. On longer routes expect tight squeezes and ladders.
Frequently asked questions
Can I enter Hölloch on my own?
No. Visits are in groups with a qualified guide.
How long is the shortest tour?
About two hours, covering the first 700 m or so.
Is it suitable for children?
Yes, from age 9, on family-friendly and beginner routes.
How long is Hölloch?
Depending on source and survey date, between about 197 km and over 211 km, and exploration continues.
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