It has been claimed that the advent of Turing resulted in an increasing speed of decodings of Enigma messages : this is wrong : there were such periods but there were also periods when the speed was slowing : exemple : in february 1943 the U boat code was during 18 days broken in 2 days or less ,which was a good result .But in june 1943 the U Boat code was broken in 2 days or less during only 1 day : a bad result . It has also been claimed that an increasing speed of decodings of U boat messages resulted in less merchant ship losses,but this is wrong :the good result of february 1943 produced a loss of 88 merchant ships;the bad result of june 1943 resulted in the loss of 27 merchant ships . Thus ...the influence of Turing and Enigma is mostly a myth created by the BP lobby . An other exemple : december 1942 : key was broken in 2 days or less during 5 days ,resulting in 76 merchant ship losses.In march 1943 the key was broken in 2 or less days during 8 days (speed was going up) and the result was ...that in march more merchant ships were lost = 131 . Why were more merchant ships lost in march ? possible reasons : weather, number of convoys, number of escorts, number of U Boats, chance , human errors, or a combination of all .