A team of daring cave divers have produced an incredible photo-reportage of the longest underwater gypsum crystal cave in the world.
The Orda Cave in the western Urals region is three miles of eerily dramatic natural channels created by water so clear divers can see over 50 yards ahead of them.
Over a period of six months the intrepid team led by photographer and journalist, Victor Lyagushkin, 40, from Russia explored the water filled cave tunnels at temperatures barely above freezing.
Scroll down to see a video of divers in the Orda Cave
