Japanese scientists say they have revived microbes that were in a dormant state for more than 100 million years.
Microbes are among the earth’s simplest organisms, and some can live in extreme environments where more developed life forms cannot survive.
After incubation by the scientists, the microbes began to eat and multiply.
“When I found them, I was first sceptical whether the findings are from some mistake or a failure in the experiment,” lead author Yuki Morono told AFP.
“We now know that there is no age limit for [organisms in the] sub-seafloor biosphere”.
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Previous studies have shown how bacteria can survive in harsh places, including around undersea vents that are devoid of oxygen.
Mr Morono said the new finding shows that some of Earth’s simplest living structures “do not actually have the concept of lifespan”.