Extremophiles on Earth have been found:

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Extremophiles, organisms that thrive in extreme environments, have been found in all of the mentioned places. Yellowstone's hot springs have extremophiles that can survive in scalding water that is nearly boiling and has a high concentration of minerals. The Atacama Desert has organisms that can survive extreme dryness and high levels of UV radiation. The Dead Sea has salt-loving microorganisms that can withstand high salinity levels. The Antarctic ice sheet has microbes that can survive in the extreme cold and lack of sunlight in deep subsurface ice.

Extremophiles on Earth Have Been Found