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17 May 1943, 00.49 hrs: by this time three specially modified Lancasters had attacked the Möhne Dam with their unique Upkeep ‘bouncing bombs’. Commanding the operation, Guy Gibson had gone first, his Upkeep mine successfully detonating against the dam wall. ‘Hoppy’ Hopgood quickly followed but his aircraft, hit by flak had crashed; his Upkeep, released a second too late, bounced over the dam wall to explode on the power station below just as Mick Martin began the next attack. He, like Gibson, succeeded – their bombs throwing towering columns of water into the air. But despite their accuracy the dam wall held.