Avro Lancaster B Mk.I special, PB996, YZ-C, No. 617 Squadron, Fl. Ofc. P. Martin drops Grand Slam at Arnesberg, 19 March 1945 (IWM)

The Grand Slam bomb drops away from the No. 617 Squadron Lancaster B Mk.I Special, YZ-C, 19 March 1945. (Imperial War Museum)

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