> In truth, there were never enough U-boats to more than dent the flow of shipping to Britain. In fact, out of 18,772 sailings in 1940, they sank just 127 ships

> In truth, there were never enough U-boats to more than dent the flow of shipping to Britain. In fact, out of 18,772 sailings in 1940, they sank just 127 ships, that is, 0.7 percent, and 1.4 percent in the entire war. I thought this was partly thanks to Turing et al's breaking of Enigma. The allies had a window into tons of "secret" Nazi communication.