A human being is a fragile creature. All it takes is a nasty bump or a wrong meal to finish us off. Still, as we have previously pointed out , under the right circumstances people can be borderline invincible. There are a few men and women who have been able to survive things that could -- and by all rights should -- kill a horde of elephants. Let's take a moment to celebrate these unkillable supermen.

5 The Man Who Was Trapped Underwater (for Three Days)

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With hindsight, Harrison Okene probably should have seen the signs. All of the ingredients were in place: He was young, happy, and gainfully employed as a cook on a Chevron service tugboat. Also, he was about to get married in a few days. All he had to do before his wedding was finish this one ... last ... mission.

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Don't worry, he lives. She's crying about catering.

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Of course, said mission turned into the most terrifying disaster movie this side of the SS Poseidon. In the early morning of May 26, 2013, Okene had just gotten up and was in the bathroom. Suddenly, his ship was hit by what a spokesman later called a "sudden ocean swell" (which is presumably corporate speak for "Shit, we accidentally summoned Cthulhu again").

Okene could only watch helplessly as his daily life turned into a trip to Rapture. The tugboat capsized and plummeted 100 feet below the surface, with him still inside. Trapped in the dark abyss with no one else in sight and wearing nothing but his boxers, Okene waded through the ship's corridors (which were slowly filling with icy water). He managed to locate a source of light, some Coca-Cola, and a few tools, and he made it to a relatively safe corner of the ship.

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That dissolved gas is oxygen, right? Right?!

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Okene ended up bunking in a 4-foot air pocket under the surface, holding back the water as best he could and stacking mattresses as the cold water rose to keep dry. To make things worse, sharks and barracudas soon started roaming the ship's interiors in search of a meal. He could hear them fighting for the remains of his shipmates in other rooms and swimming in the water just below him. He had no food. The salt water and the bumps from the accident were wearing his skin raw. There was far too little air for him to breathe, and he was ruining it with every breath by puffing out carbon dioxide. He would not last beyond a couple of hours.