Board Thread:General Discussion/@comment-26242189-20160627212006/@comment-26400139-20160628191706

I'm pretty sure they made a seal that covered a large area able to accomadate all the monsters, in the form of a large sphere/cube/dodecahedron^3/frog/universe shape theory/etc, thus preventing monsters from digging out and instead running into the Barrier.

If a human fell into the garbage dump, they would probably fall down the waterfall below it, too, and die without anyone's knowledge.