The 1943 French comic book, "Red Rackham's Treasure, " included a shark-like submarine with dorsal fins and a tail.

CNN: Winged luxury submarines 'fly' underwater

Humans pose much more of a threat to sharks than the reverse: 17% of more than 1000 assessed shark species are threatened by fishing and bycatch, according to the Red List of the International Union for the Conservation of Nature.

UNESCO: Open Access to Scientific Information

So Kahn flew a red protest flag from the stern of his racing yacht and forced his son Samuel (Shark) Kahn to forfeit a first-place position in the Mumm 30 World Championship in Toronto last September.

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