The Doux de Coly is one of the most spectacular cave systems in the south west of France.
The last push dive here was done around 3 years ago by Olivier Isler using his triple-redundant RI2000 rebreather during a solo dive, reaching 4300 m.
He left the end of the line in 30 m depth with a max depth of 60 m during the dive.
(Please click on the profile for a larger version)
Dr. Reinhard Buchaly was there during Isler's dive and thus was familiar with the dive site before this project