.. this is all probably due to us just seeing one of your backups - not whatever you finished up with.
If you download this BAK-file and put it (as CGZ) into place you'll see it ... if you don't spawn there, then move outside your regular area and press F5 ... look somewhere below your floor level - it's just a miniscule area with some water, a wire-mesh and a grenade lying about, no way out from there. Just fix the node - that'll (probably) make my comment obsolete ;-)