On floor 88, I was entering and exiting between room 110 and 123 multiple times, pressed Ctrl+A somewhere in the process, then suddenly I was entering room 125 (start room, north of 123) from the north, going OOB! Haven't been able to reproduce it. Anyone care to experiment? Save state in room 110 was good for experimenting.

Btw, this all happened because I found another skip in room 110: By exiting and entering quickly, then pressing Ctrl+A, you're able to remove the C/Gen in the room, so you don't have to fetch the grenade in the middle of room 123.