AEDe
(AEDe)
48
Sorry for late reply,
it’s easy to miss the message here.
Abkhazia it is not Russia actually, massif Arabica is located very close to the border )) Mountains there has unique geology. The deepest Russian cave is Throat of Barlog it is only 950m deep it also located in Caucasus.
There are many beautiful caves in Russia , not such deep as Verevkina or such long as Mammoth cave in US, but each has its own peculiarity and unique. You can also take a look at instagram of Perovo caving club it not have many photos but still )
There is no such large preasure differense in cave. 2km of air creates pressure like 2m of water. So of course there is no need of decompression.