Surfaced attacks on convoys when radar is in use by the escorts is a certain way to get killed. You are blind but they can see you. I was attacked twice by a corvette in such conditions until it suddenly hit me that he had radar. How did he manage to come out of the fog headed straight for me? After that I dove and broke off contact. From that point forward I have always made submerged approaches in bad weather and of course the success rate is lower. One change of course by the convoy and you are left behind. The only way of getting a hit is to use your hydrophones and plant yourself where they will sail right in front or behind you and hope not to get rammed.
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