Longest Underwater Gypsum Crystal Cave

Longest Underwater Gypsum Crystal Cave:
A team of daring cave divers working on Orda Cave Awareness Project have produced an incredible series of photos of the longest underwater gypsum crystal cave in the world. Located near Orda village in Perm region, Ural, 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.