Here's some rad excerpts from Tartigrade wikipedia page on how insane these little dudes are

Tardigrades have survived all five mass extinctions.

Tardigrades are the first known animal to survive after exposure to outer space.

...they can go without food or water for more than 30 years, only to later rehydrate, forage, and reproduce.

Tardigrades are thought to be able to survive even complete global mass extinction events due to astrophysical events, such as gamma-ray bursts, or large meteorite impacts.

Would be pretty spooky if they weren't so tiny and kinda cute