Translations:The Legend of Zelda: The Wind Waker/Unused Rooms/Page One/15/en

Interestingly, some concept art included in Hyrule Historia suggests Old Hyrule was enclosed in a dome you could only get to (and potentially explore, like Subrosia?) by using some special magic portals, guarded by fishermen. The Great Sea in the final game does have a featureless invisible plane not very deep at the bottom, as remants of this plan. Using cheat codes, it is possible to walk on it.