The Dambusters Raid -The results of the RAF attack on the Moehne and Eder Dams. 17th May 1943 The breach of about 200 feet width in the Mohne Dam . it can be seen that the lake has been drained of the major part of its contents , but the water is still pouring through the breach . The foam and disturbed water visible immediately below the bridge covers the space where the destruction was situated the Power Station . The water draining from the lake overflowed and destroyed the Dam surrounding the Compensating Basin. The Auxiliary Power Station stands on an island on the remainder of the Dam .