Pressure loving organisms that live either at the bottom of the sea or in the deep hot biosphere. Since water pressure roughly doubles every 10 meters, the deep trenches of the ocean are many atmospheres more pressured than us. If this simple calculation were true then two Km deep would be 1 millon or more times atmospheric. Probably, it's less than that but anything that lives that deep has to be pretty tough.

See : extremophile

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