It thawed out — and then it multiplied.

Scientists successfully revived a “zombie worm” that had been frozen for 24,000 years, revealing new insight into how life survives in the most unforgiving environments over extended periods of time.

According to a study published in the scientific journal Current Biology, researchers found that the microscopic organism — identified as a rotifer — is a small, multicellular animal commonly found in freshwater environments that is known for its unusual durability, FOX News reported.