first go to pacifidlog town then go to your left the should be an ocean current go aliitle bit below the middle then let the current take you you WILL have to go on land about 3 times then there will be a dive spot semi protected with rocks(dont worry its east to get around) then use dive if your at the right place then there will be some brille it says to go up here the there the cave. good luck.
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In second room in Sealed Chamber, make your party pokemon, Wailord first, and last in Relicanth. Then, read the braille.
go to the sealed chamber and get relichant in front and wailord in last......
When you're in the Sealed Chamber, Relicanth should be first and Wailord should be last.
Get relicanth and wailord. Put relicanth in the first slot and the wailord in the last. Then make a pokemon who has dig use dig.
I really don't know how you open it. I have ruby, and have all eight badges, but all I found was a description written in dots if you swim southwards.