Caving In Chartreuse: Traversee Trou du Glaz-Grotte Annette
By Sylvain Duloutre-Oracle on Oct 14, 2008
This "Dent" is well hollow : 50 kilometers of passages and pitchs have been explored on several steps, for a ramp of 673 meters. Eight entrances allow you to come into this labyrinth.
It took us about 5 hours crossing Trou du Glaz to Annette Cave (3000 meters long with low point at -162).