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Scientists have discovered astonishing microbial diversity deep beneath Earth's surface, which could have implications in the hunt for life on Mars.

The study, published in Science Advances, examined microbes from up to 3 miles underground and 1,600 feet beneath the seafloor.

These organisms thrive in extreme, low-energy environments—conditions that could mirror those on Mars or other planets with subsurface ecosystems.

Led by Emil Ruff, the research is the first large-scale comparison of marine and terrestrial subsurface microbiomes, offering a glimpse into the possible adaptations of alien life.

"Here on Earth, life exists pretty much everywhere where the temperature is (at least seasonally) between the freezing and the boiling point of water," Ruff told Newsweek.

"3 kilometers beneath the surface of Earth and Mars look very similar, so understanding Earth's subsurface life[...]will provide clues what to look for on other celestial bodies."

Source: Blueprint for Possible Alien Survival on Mars Found Underground | Newsweek