Judging by size alone, the nematode looks like a creature that other bugs could squish like a bug. Live Science writes that nematodes usually measure about a millimeter long. For context, the average adult German cockroach reaches 10 to 15 times that length, per the University of Florida. Also super bugs in their own right, roaches can withstand about 10 times the dosage of radiation it would take to kill a human. Yet Pest Lockdown writes that freezing them at zero degrees kills them in about an hour. The nematodes found in Siberian permafrost, by contrast, managed to last 42,000 years. Heck, these creatures even outlasted the permafrost, which released them from their frigid prison by melting.

Scientists made the stunning discovery after analyzing 300 samples of Arctic permafrost deposits. Once the worms were sufficiently thawed, they began moving and eating. This isn’t the first example of the nematode’s insane staying power. Live Science notes that “some are found living 0.8 miles (1.3 kilometers) below Earth’s surface, deeper than any other multicellular animal.” Depending on the food source available, nematodes in the Indian Ocean can form one of five different mouths while others have evolved to live in slug intestines. The nematode also isn’t the first organism to pull a Lazarus after tens of thousands of years entombed in ice. A giant virus holds that honor. So as the world’s ice continues to melt, be on the lookout for dino disease to make a comeback.