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My problem isn't what it is, it's how close he had to get to it to take that photo. Sweet Mother, any thing inside spear gun range is too close...

That's one sort of gun I've never fired...Spear gun. I reckon it's be fun although if it was being fired at a shark and I missed...Not so much fun.

You have to have a bangstick for sharks. Simple things, just poke the shark and a 12 gauge shotgun round fires. It either chases them away or pisses them off for a quick kill. :)

Spear guns are for edible stuff that can't make you dead in a big hurry.

Would a torpedo work?

Absolutely. But you might have a small problem getting clear. Water doesn't compress, but the human body does. In an underwater explosion it would be problematic.