Oblivion talk:Fathis Aren's Tower

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There is another way out of the Grotto. Go down the increasingly deep pit where the Giant Slaughterfish is located. Once you go through the hole at the bottom, find a path. At the end of this path is an exit which leads outside-- to the very bottom of the Niben Bay. Hope you know how to swim.

It's not mentioned here, and the page on Mudcrabs says there's only one giant one found in Greenmead, but I encountered two mudcrabs of 2 or 3 times the normal size in the wizard's grotto.