Alright you all know that impenetrable barrier of garbage at the end of the Map Right? Well at 21;147 there is actually a Gap to... certainly not Map 4, actually not to anywhere but there is a Gap without a Wall debris blocking the way. Just thought you might be interested in it, Also isn't this why the Ladder was invented?
Why the hell have people not climbed or just knocked down that wall Berlin Style? Well who am I to question the undeniable logic of the Devs but meh...