A radioactive wasp nest was found next to a site in South Carolina that once made key parts for nuclear bombs.

The hazardous insect abode was located near a set of tanks filled with liquid nuclear waste, although the team didn’t detect any leaks. Instead, experts believe the nest set off Geiger counters through what’s known as “onsite legacy radioactive contamination.

The U.S. Department of Energy said workers at the Savanah River Site on July 3 found an empty wasp nest with abnormally high radiation levels. Officials suggested nearby “legacy” waste contaminated the object. The nest was safely disposed of, and the public is in no danger, they said.