What was the London Gun exactly during WW2?

Question: What was the London Gun exactly during WW2!?

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Best Answer - Chosen by Asker:

Wiki gives all the answers of your question :)
http://en!.wikipedia!.org/wiki/V-3_cannon

http://en!.wikipedia!.org/wiki/Project_Bab!.!.!.Www@QuestionHome@Com