A team of cave divers have taken an unbelievable photo-reportage of the longest underwater gypsum crystal cave in the world.

The Orda Cave in the western Urals region is three miles of dramatic natural channels made by water so clear it is visible to divers over 50 yards ahead of them.

For six months the team led by photographer and journalist, Victor Lyagushkin, 40, from Russia explored the water filled cave tunnels as cold as an ice.

There is extremely low water temperature, about 3C and 20C below zero on surface. Under these circumstances shooting became very challenging, Lyagushkin said.

Orda Cave is also the biggest underwater gypsum crystal cave in the world and second in Eurasia in terms of volumes of its galleries that stretch up to five kilometers.