That too is a good point, but ofc any U-Boat commander who knew the waters of the Channel wouldn't dare enter it unless they had a suicide wish, or was Bernard
. Back on topic one of my greatest escape from a DD was in early or mid 1939, I had come across a convoy that happened to have a battleship in the center. I played a trick that was a gamble to get the attention of the starboard side DDs by going to flank speed thus distracting them, a few seconds after they had turned towards my boat I went silent and crept up on the rear starboard quarter. Now in a normal situation I would have gone after the largest or most valuble ship in the convoy like an oil tanker but not this time. The chances of finding a battleship where already slim to none let alone in a convoy so the battleship became the target. Now within the convoy itself and felling confident I went up to standard speed to get to a good shooting distance while using a tanker as a "hat" a-la-Down Periscope. Then came the time to strike, up to periscope depth, all foward tubes open, torpedo speed set to high, magenetic detonators, three torpedos where set to go under the battleship and detonate under the keel, the other two would hit just below the water line. Then the torpedos where fired, I veered the boat to port at flank speed again this time to distract the the DDs on the port side. Again the trick worked, down to 150, silent running. The port side DDs where now within the convoy moving towards the last known sound contact, meanwhile I was moving my boat up the port side of the convoy zig-zagging to confuse the DDs and make it more difficult to be tracked. Once the DDs had reached the center of the convoy, I made a 90-degree turn to port and slipped away with the DDs still searching around the area of the slowing sinking battleship.