Duration:00:02:02

2 minutes video of an underground lake in a gypsum quarry called Roger Forest. Thanks to Hcl for the rushes with his waterproof camera and his huge diving spotlight.

On an inflatable mattress in the underground lakes of Triel / Seine. Warning! In this quarry, the oxygen is reduced. Do not go without air analyzer, please.

The underground lake in the salt mine is over 100 meters long and 40 meters wide. Across the bridge by boat. The scope of the vault is impressive!

The viaduct Garabit is made entirely of metal. It was built by Gustave Eiffel & Cie in 1884 under the direction of the architect Leon Boyer. It is 564m long. Since the construction of the dam Grandval, a lake was formed under the viaduct, 95m below. Trademark Construction of Eiffel, it is no less than 678,768 rivets were used for construction.

In the first series of work, caretaking had significantly increased, following numerous visits from people not covert. They finally opted to remove the tarps. Thus, the guards could easily see people climbing. This photo was taken the day before the parade of July 14, 2006. The lack of cover in no way hampered the ascent to the summit.

At the bottom of the abyss, a gallery runs deep. Unfortunately, difficult to go further because the lack of oxygen is very strong. Warning!