I was yesterday on the top of the rocks in Svetlojarsk. Near the east end i was falling to a lower platform. There is a little crack, between two rocks. If you go to this crack, you will glitch trough the rocks, and be captured between the rocks and the earth in a inaccessible cave.
If necessary i can go back and take an Print Screen from the „entrance“.
In the Attechment i have spotted the entrance.
sorry for my bad english.