This route takes you first to the Dent summit, with its uninterrupted views over the Grenoble valley and the Belledonne mountain range.

We will then enter the underground network via the highest entrance currently known, at an altitude of 2022 metres. The very vertical underground route proposed here will take us to an immense underground chamber of unimaginable dimensions from the outside. This is where we will reach the outside, on the east face of the massif. A final look at the expanse of the valley will precede our return to the morning’s starting point.

It will complete this route, which corresponds to stage 3 of the 7holes Challenge.