Ordynskaya Cave in Russia

The Worlds Greatest Gypsum Cave

The longest beautiful cave under the water in Russia.
This cave was created before human beings born and it took about one million years to be created.  The length is 5m and the depth is 200m.  The temperature in the cave is about -23 and the temperature of water is about 5℃, it is very cold.  Surprisingly, the cave is made by crystal and because the clarity of the water in the cave is very high so the divers look like they are flying.
This cave already got World national heritage site.  Sometimes it appear on TV and be introduced but still minor cave in the world, compared with other places which got World national heritage site.  But you must see very beautiful sight if you visit there such as the fantastic picture below.
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ロシアの西部ウラル地域にあるオルダ洞窟について。
世界最長の水中石膏洞窟と言われています。