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Chuuk lagoon would be great, I recently read about a place somewhere in europe where the germans dumped a bunch of rare artifacts in the lake during WW2 and people keep finding amazing stuff. But I think my ultimate would be the Andrea Doria. I know it will be a while before I even come close but it would be an amazing dive.
I only have one location on my list that needs to be realised. Antartica.
Bikini was also on the list but since diving has been suspended in the area indefinitely, who knows when divers will be able to go there again.