A second world war bomb exploded without warning in a field in Limburg, Germany, during the early hours of 23 June.
Nearby residents heard the explosion and discovered the crater it left behind, measuring 10 metres wide and 4 metres deep.
Bomb disposal experts think it was created by a 250-kilogram bomb that, 75 years ago, was faulty or failed to explode on the soft soil and has only now just exploded triggered by a decaying detonator.