Board Thread:General Discussion/@comment-32194023-20170603220826/@comment-32194023-20170605202105

Of course, it could turn out the magical power of the barrier is designed exactly to confine the spacetime of the Underground and sever it from the spacetime of the rest of the cosmos. In that case, no wormhole produced in the Underground would get them out of the Underground at that moment in time - only before the barrier existed or after the barrier ceased to exist.

Though then would end up opening the logical hole of why things may enter, but not leave the Underground...