Sixty years ago, this was the scene over Germany.<br/> Allied bombs tumble from the sky and onto Nazi positions.<br/> It was part of a fearsome bombing campaign, the legacy of which reared its head on Saturday.<br/> Officials evacuated 45,000 people from this town - Koblenz - after discovering a massive unexploded bomb in the Rhine River.<br/> Bomb disposal experts were taking no chances with the device, which is powerful enough to potentially knock out a building block.<br/> (SOUNDBITE) (German) BOMB DISPOSAL EXPERT, MARCO OFENSTEIN, SAYING:<br/> "We have a British detonator, which was surrounded by water for a long time and the explosives within the detonator react with water over the time, which makes it very dangerous."<br/> The bomb is one of these: a blockbuster.<br/> Weighing 1,800 kilograms, they packed enough punch to knock out a factory or dam.<br/> During the Second World War, almost 100, 000 of them were dropped on German targets, and many remain undiscovered and unexploded.<br/> Andrew Raven, Reuters
