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Some eyewitness accounts here are interesting. It does also confirm what I had thought that at least one mine failed to explode in the crash/fire; one can only imagine the damage that would have been caused if it had.
German Heinkel III bomber Crashes in Clacton | WWII Forums
30.04.1940 3./KGr.126 Heinkel He 111 H-4 Wnr.(not known) Oblt.Vagts
Location: Clacton on Sea, Essex, England
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The Germans used the mine to create a blast wave which blew out windows and removed roof tiles. It wasn’t meant to cause destruction by itself, it was the incendiary bombs dropping into the roof spaces and using air drawn in through the broken windows that was to create a firestorm. The Allies later copied this to devastating effect as most are aware.