We still don't know where that underwater tunnel goes, but I wouldn't be surprised if it goes to Undella Town.
Until reading that, I didn't even think of the possibility that Shizui's gym could be there or that we could be going there before the League.
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http://i50.tinypic.com/23qx00.jpg
"First time I got punched in the face, I was like "oh no", then I was like "this is a story"."