Orda Cave (Ординская, Ordinskaya) is a gypsum crystal cave found underneath the western Ural Mountains. The mouth is near the shore of the Kungur River just outside Orda, Perm Krai in Russia. The cave system stretches over 5.1 kilometres (3.2 mi) with around 4.8 kilometres (3.0 mi) over the overall length being under water. This makes it one of the longest underwater caves and the largest underwater gypsum cave in the world. It contains the longest siphon in the former Soviet Union (935 meters).
The mineral-rich area surrounding the cave filters the water and makes it very clear. Divers have a visibility of over 50 yards (46 m) making it an ideal location for photographic expeditions. Victor Lyagushkin, a journalist and underwater photographer, led around 150 expeditions into the caves over a six-month period in 2011. The photographs taken by his team were published in the Orda Cave Awareness Project alongside stories from other divers who had visited the cave system. During the dives Lyagushkin used a funnel system to direct the air bubbles to the mouth of the cave and away from the delicate gypsum, fearing that it might easily be damaged. The diving team were also the first people to produce a spherical panorama of an underwater cave.
A local myth tells of the "Lady of the Orda Cave" who is said to live in the caves. In 2013 Natalia Avseenko, a former free diving champion, was featured in a photographic series designed to illustrate the legend. Lyagushkin returned to the site after leading the 2011 dive, taking photographs of Avseenko over a two-day period. The images were taken at depths of up to 17 metres (56 ft) with temperatures that reached down to −23 °C (−9 °F). It is 3 degrees to 20 degrees Celsius below zero just on the surface.
- "World’s First Underwater Cave Spherical Photo Panorama". Caving News. 26 February 2013. Retrieved 19 September 2013.
- "Underwater wonderland: Divers take the plunge to reveal stunning images of beautiful crystal cave in depths of Russia". Mail Online. 28 June 2011. Retrieved 19 September 2013.
- Sinha, Sanskrity (28 June 2011). "World’s longest underwater ‘crystal’ cave in deep Russian waters revealed (PHOTOS)". International Business Times. Retrieved 19 September 2013.
- Johnson, Sarah (24 January 2013). "The real-life Lady in the Lake! Russian swimmer goes deep into underwater crystal cave to re-create legend of spirit that is said to haunt it". Mail Online. Retrieved 19 September 2013.
- "Orda Cave, Russia". Diving-Industry.com. International Diving Industry Directory. 17 August 2011. Retrieved 19 September 2013.
- Владимирович, Т.В. (2013). Россия глазами блогера. Издательство "Вече". p. 193. ISBN 9785444470077. Retrieved 5 July 2015.
- "Interview with NGC Photographer and Cave Diver Viktor Lyagushkin (+BreathTaking Underwater Photos)". pxleyes. Retrieved 19 September 2013.
- "Orda Cave Awareness Project". OrdaCave.ru. Retrieved 19 September 2013.