File this under your worst nightmare. While chilling in a shark cage, admiring a great white from behind the safety of a row of steel bars, the massive beast lunges for a piece of tuna and breaks the rail. Next thing you know, the shark is now thrashing around in the cage with you. Luckily, this diver is a pro and was smart enough to drop out of the bottom until the 13-foot shark found its way out. Everyone, even the great white, made it out completely unharmed.