The rock formation on the hillside 200 meters south of Kamyshovo can be entered by a player. The player can find a spot in the glitched rocks where his weapon will stick out of he rocks and enable him to shoot fresh spawns on the beach or anyone passing nearby with impunity.
These rocks have been reported numerous times for killing players as well as being enterable. https://www.youtube.com/watch?v=aEBglzx5KHk Since then I believe some of the rocks have been changed as the ones in the video do not represent what the rocks look like .57.
However, I have been seen a player inside the rocks, and seen multiple people killed by this glitching player. http://images.akamai.steamusercontent.com/ugc/45381685705376277/38062F66E8D2729DE4DA25B4D3499BFDB84A48F7/ (you can see the players improvised silencer sticking out of the rocks) Although I have yet to be able to reproduce this specifically in this set of rocks, I was just today able to reproduce it in the rocks to the NE of Svetlojarsk at 140019
In my experience, as of .57, more than half of respawns occur at Kamyshovo, and on high pop servers, spawn camping of this location is common, which makes exploitation of this glitch even more atrocious considering it makes you not only hidden, but invincible without hacking and able to influence the dynamics of the entire server.