School trips

Take your students on a safe, fun and educational tour of Europe’s largest underground lake. While the older children will learn to decipher the mysteries of the formation of the Alps, the younger ones will marvel at this supernatural journey into the bowels of the earth. A safe and inexpensive outing that perfectly complements a stroll through the vineyards on the Bisse de Clavau and through the old town of Sion and its castles.

Our beautiful shaded terrace is also at your disposal for a picnic before or after your visit.


Approximately 30 minutes for a guided boat tour & 10-15 minutes for the free discovery of our new didactic area.

Boats and capacity

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.


Free coach parking available at 100 meters from the cave

School rates

CHF 7.- per kid (5-15 year old),
1 teacher free for each 10 paying children

Opening hours & bookings

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 .

Visite guidée en barque