Travelling approximately 110 kilometres south of the Perm Krai, or about 270 kilometres east of Ekaterinburg, we will come across Mount Kazakovskaya, which is about 50 metres high. On its summit is the entrance to the Ordinskaya cave. It has the title of the largest plaster cave on the planet and is among the 20 largest. The Ordinskaya cave is named after the Ordan people because it is the closest town to the cave. This impressive gypsum cave is distinguished from the rest by the fact that most of its area is under water. It is about 300 meters of dry cave against more than 4 and a half kilometers of underwater extension. In the underwater part of this cave there is a siphon almost one kilometer long, the largest not only in Russia but in the whole territory of the former Soviet Union. Due to its peculiar condition, the Ordinskaya cave attracts tourists from all over the world who wish not only to walk the 300 meters on the mainland but also sportsmen who are looking for the strange experience of diving inside a cave.