[brett25]

i just finished reading Iron Coffins by Herbert Werner, you can read here that many of the u boat casualties later in the war were the U boats returning to their bases in the Bay of Biscay. The allies were waiting for them and the uboat's last leg home often became a turkey shoot for the allied aircraft. So depending on how you opted-either you returned slowly under water, undetected, or all out full throttle running the gauntlet. Either way your chances were not good, as, on average, only one out of every four boats would make it back.