I never thought I would be happy to hear the corridors are still accessible, but that means there's some commonality between this world and ours. My current hypothesis is that we're somewhere that's so far away from the worlds connected to ours that we're simply cut off from the existing network of Corridors of Darkness.

[ He raises his hands as he talks, drawing glowing, deep purple lines with his fingertips to form something that almost looks like a pair of subway maps - one much smaller than the other and completely disconnected from each other. ]

Did you notice anything unusual about the corridors while you were in them? Aside from all of them leaving you in the wrong place on exit, I mean.