Excellent - with the special question having a point-mark of three, two will go to Strolen, and one to Ria.
The man was a treasure hunter, who dived into a shipwreck to search for treasure. Unfortunately he forgot to check his air supply and thusly ran out when he was at the bottom, drowning.
Captain Penguin: 1
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Lighter than what I'm made of,
More of me is hidden than is seen.
What am I?