One way rubble gets you stuck
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At the rubble pile at approx. -733 W, -664 N it will allow you to cross over. Beyond that rubble there's a bit of space to walk around, but there are no open paths out of a little L section and you can't cross the same rubble pile back over so you're essentially stuck there as far as I could manage. Thankfully Specter was nice enough to quickly come and tele me out, but otherwise I'm sure I would've been left with just starving myself and losing all my inv because I didn't have teleport.
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Sounds like the dread rubble monster struck again!