I don't envy you, as I just spent 4-5 hours swimming underwater, looking for crabs. I ended up saving the game every time I saw a crab, so I could reload if it didn't give me a shell. Also, I saved just before I handed in the 3 shells, so I could get the needed combo of 2 and 1 underwater device.
I hope the scuba gear is never needed after the underwater city, as I sold it!
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