Holding his Lancaster AJ-P steady at 60ft above the waters of the Mohne Dam,'Mick' Martin releases the cylindrical, bouncing bomb to send it spinning towards the dam wall. On the night of 16/17 May 1943 nineteen specially modified Lancasters of 617 Squadron departed from RAF Scampton on one of the most secret and daring bombing operations undertaken during World War II to destroy the huge hydro-electric dams in the Ruhr valley.