Originally Posted by
Beamr
Interestingly, apparently in total three Tallboys were found unexploded at Sorpe dam in ´58/´59. The first one found in 1958 was defused 6th of Jan 1959, and this is mentioned in many sources throughout the internet.
BUT: the Reuters news video linked above has the headline "More Tallboys Discovered In Germany" with comment "Two more RAF 5 1/2-ton 'tallboy' bombs were found, Jan 19, in the drained Sorpe dam reservoir, North Rhine-Westphalia."
So its four tallboys with the polish one counted for, I reckon there must have been more. Or be more yet to be found.
Sorpe dam raid took place on 15th October 1944 by eighteen Lancasters of 9 Sqn. Sixteen bombed with two hits on the crest and another three on the air side. However there was no breach possibly due to the Germans lowering the water level so reducing the pressure on the water side of the dam. No losses.
All of the bombs were supposed to be fitted with delay fuses - twelve with a 11 second delay and the other six on a 30 minute one. However it later emerged that at least two bombs were fitted with direct impact pistols. Again there was a mosquito camera aircraft present filming the attack.