Groups visits

Only a 5-minute drive from the freeway, the underground lake is a perfect stop-over for groups on the way to the most famous destinations of the Alps!

Early tours available on request for groups, starting at 9 am any day during the season. (Previous booking needed) .
Upon request we accomodate groups for private tours and special events after closing time.

Adults: CHF 10.-
Children: CHF 7.-
Free entrance for bus driver

Free parking lot for private vehicles and coaches, 100 meters away from the entrance

We know that accurate planning and timing is essential when traveling with groups. Therefore groups may book a departure at a specific time. Groups with confirmed prior booking have preference for boarding and can skip queue line.

Note that in case of delay on your side, you must inform us at least 45 minutes before the planned arrival, otherwise we will not be able to grant you priority on boarding .


Around 30 minutes on the boat plus 10 to 15 minutes for our new visitor center. For a stop-over with a group, 60 to 90 minutes are needed from the time the clients get out of the bus until they are back at the parking lot.

4 boats are available for a total capacity of 120 people.
1 boat with 16 seats, 2 boats with 32 seats, 1 boat with 40 seats.

Visite guidée en barque