"Bizarre ant colony discovered in an abandoned Polish nuclear weapons bunker"

AT:

Because conditions in the bunker are so harsh, constantly cold, and mostly barren, the ants seem to live in a state of near-starvation. They produce no queens, no males, and no offspring. The massive group tending the nest is entirely composed of non-reproductive female workers, supplemented every year by a new rain of unfortunate ants falling down the ventilation shaft.

...

if a queen ant fell down the pipe, she might join this colony and start reproducing.