btw: after completing Skull Castle, just head right to the Temple of Isis which is the giant egyptian tomb gaurded by the Sphinx sitting on the west side of the 1st sea (north of the leprechan). I didn't know exactly how to pick the lock on the temple door, but the door itself was transparent and I was able to wiggle through the doorway easily like it was watery current trying to push me back or something... Once inside the Tomb of Isis, you must find your way out the backdoor and into the 2nd sea.
-EH
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