*Exploring the Longest Underwater Cave in Russia*

Ordinskaya or the Orda Cave is the longest underwater cave in Russia. Accoridng to the Orda Cave. Awareness Project it is the first and only underwater gypsum excursion cave in the world. The two founders of the project are Vitya Lyagushkin, a famous underwater photographer, journalist and dive-instructor; and Bogdana Vashchenko, a diving journalist.

The cave is located in the western Urals region of Russia and consists of almost 5 kilometers (3 miles) of dramatic natural channels with water so clear divers can see over 45 meters (50 yards) ahead of them