Spoiler alert: He's found in Sydney Harbour (4)

I believe the answer is:

nemo

(Other definitions for nemo that I've seen before include "Jules Verne's submarine captain" , "- me impune lacessit (motto of Scotland)" , "Finding -, animated film" , "Jules Verne captain" , "Captain of the Nautilus" .)

I've seen this clue in The New York Times.

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