Unexploded bomb discovery maybe ordinary for Germany, but this new discovery is the largest found in German history. A nearly 4,000-pound bomb, packed with more than 3,000 pounds of explosives, as well as other unexploded ordnance, were discovered in the Rhine River, Koblenz, Germany. The unexploded bomb is believed to have been dropped by the British Royal Air Force during World War II.

It’s estimated that a bomb this size could blow out windows in a half-mile radius if it were detonated. A report reads,

“About 45,000 residents of the German city of Koblenz, nearly half of the city’s population, are under evacuation orders Sunday following the discovery of what local officials said was one of the largest unexploded bombs ever found. “

The bomb and 275-pound American bomb also found nearby, the report says, were discovered when the water levels have dropped significantly—due to a lack of rain over the past few weeks. According to German news outlets, the bomb lies in about 16 inches of water, partly buried in mud, making it difficult to access the detonation fuse.