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Davy Jones doesn't like you touching his stuff, and he's booby-trapped it. Instead of harmless stuff like laxatives or superglue, he uses hundreds of atmospheres of pressure. Cast iron is filled with small bubbles the way a cheap chocolate bar is filled with puffed rice. As salts eat away at the cast iron, it becomes porous. Gases become trapped in its many little bubbles. Because they are trapped at the bottom of the ocean, though, they're trapped under enormous pressure. When they're brought to the surface, the pressure on the outside of the pan is released, meaning that instead of being pressed equally from within and without, it's riddled with hundreds of tiny bubbles exerting hundreds of pounds of pressure per square inch. If that pressure isn't released gently - blam.

