Duration of the tour is around 30 minutes and the temperature in the cave is 15 Celsius.
Due to the COVID19 crisis prior booking is compulsory for all guests (from September 13th onwards a COVID Certificate must be shown upon entrance). You might use our online booking system to choose a suitable date and time for your visit. Last minute online booking are welcome.
All tours are guided tours on a boat with explanations in English, French and German.
Other languages on request depending on availability.
Pictures without flash allowed. It is not possible to access the cave on foot. Swimming and diving are not permitted.
Before or after your visit our new didactic area will allow the curious to understand the mysteries of the cavity and its formation over the centuries, while lovers of minerals of all kinds will appreciate the shop and gourmets will take a break in the cafeteria.