The guided tour begins in a natural setting of quite stunning beauty. At the foot of a givetian limestone cliff, on a catwalk overlooking the river "Eau Noire". Visit the two upper galleries of the Neptune Caves, with their superb dripstones (stalagmites/stalactites). The visit continues with a 10minute boat trip along the underground river, highlighted by an unusual "music & light" display, during which a number of rushing waterfalls form an impressive backdrop to the display : music by Vangélis, stroboscopic effects...

Constant temperature 12°C.