Ants trapped for years in Soviet bunker; survival by cannibalism

The study examines a large population of wood ants found at the bottom of a sealed Soviet-era bunker in Poland. The ants had entered through a ventilation shaft from a nest in the forest above, but the shaft offered no way back out. The bunker population had no queen or brood, so it could not reproduce; it persisted through a continuing fall of worker ants from the nest overhead. Researchers documented the colony’s size and structure, including a conspicuous accumulation of dead ants on the bunker floor.

The central finding is that the trapped ants survived in this isolated, resource-poor setting largely by eating their dead nestmates. The corpses supplied food that would otherwise have been scarce, while the steady arrival of workers from above replenished the population. The bunker ants were therefore not an independent colony thriving on their own, but a dependent offshoot maintained by accidental access to the parent nest. The case illustrates how social insects can persist under extreme conditions through both the resources and the steady influx of individuals provided by a larger colony. It also shows how a human-made structure can create an unusual ecological trap: ants continually entered a space from which they could not escape, forming a population sustained by cannibalism.