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Polish Academy of Sciences zoologist Wojciech Czechowski and his colleagues discovered the nest after a group of other zoologists found that bats were living in the bunker. Though it was technically not legal to go inside, the bat researchers figured out a way to squeeze into the small, confined space and observe the animals inside. Czechowski's team followed suit when they heard that the place was swarming with ants. What they found, over two seasons of observation, was a group of almost a million worker ants whose lives are so strange that they hesitate to call them a "colony" in the observations they just published [1] in The Journal of Hymenoptera. 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.
[1]: <http://jhr.pensoft.net/articles.php?id=9096>