Another reason to get the teleport spells from mooncraft quickly: they'll get you out.
One possibility that MIGHT work: save the game (in another slot!), set graphics to software mode, quit the game, start it again and restore. The game appears to handle walls and floors a little bit better in software mode. Perhaps even saving and restoring alone suffices; I've noticed sometimes that when I restored I was initially too low, but then I rose up to floor level.
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