1. Go into the Hospital in Military Base near Kamenka.
2. Go behind the stairs, you will notice weird metal part sticking out of the wall and possibly some loot floating in the air(I saw apple, pepper and banana so far)
3. If you go past that metal fragment and the turn around you will notice it has enlarged to form large metal wall/fragment that blocks your way out.
4. The only way out is to sprint right into it and glitch through it.