If you live in Koblenz, Germany, forget brunch this Sunday. Half the city, or 45,000 residents, will evacuate after officials found one of the largest unexploded bombs in history. The bomb, thought to have been dropped by the British Royal Air Force during World War II, weighs 4,000 pounds—3,000 of which are explosives. The bomb was found in the Rhine River, where the water level has dropped recently. If exploded, the bomb could cause destruction over a radius of more than 70 yards. The bomb will be defused, even though it’s in 16 inches of water, and the detonation fuse is partially blocked.