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I don't know if this has been found already, but after I obtained Surf I went to explore a bit and in the Acqua mines, right where you catch Libabeel you can see an inaccessible lower part of the room.
Well, if you stand where the pic shows and go down, you will actually enter the cave, and when you get out you will be on that part of the room.
Basically I was able to reach Phlox town (and the lab) when I still had not explored the Naljo Ruins.
I reset and continued the normal order though, fearing that it would cause the game to break later.
