Construction renovations to a German soccer stadium were briefly put on hold this week after an analysis of the nearby area discovered an undetonated bomb dating back to the World War II era.

The bomb, which weighs more than 500 pounds, was safely deactivated after the stadium was evacuated. It was discovered through an aerial analysis of the surrounding landscape, which pulls information from various sources to try locating potential bombs that have not yet detonated.

Crazy as it seems, bomb discoveries are very common in Dortmund and in other parts of Germany. The area was heavily attacked during World War II, and many bombs dropped simply didn't go off as planned. They remained buried in the rubble when cities were rebuilt.

That has brought unforeseen consequences: No one is sure where all the bombs are, but many are confident that further undetonated explosives are yet to be found. The city of Dortmund is well-acquainted with the threat of underground bombs. Last year, the discovery and subsequent deactivation of a bomb required 20,000 citizens to be relocated.

Officials said that the bomb was safely removed and did not interfere with any planned events at the stadium. At the same time, it's very possible there are other bombs in the stadium's vicinity that simply haven't been found yet. The city is careful about inspecting areas prior to construction work to make sure any underlying explosives are caught and properly handled.

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