To reduce the German's WWII submarines visual and radar cross section, snorkel were retrofitted to the existing Uboats. The schnorchel allowed Uboats to remain submerged somewhat indefinitely. They also reduce the radar crosssection by about 1/3 of a surfaced Uboat. The German's also applied radar absorbing (Stealth) materials to the schnorkels to further reduce the radar returns by application of the stealth coatings. Unfortunately, these efforts came too late in the war to effect the battle of the Atlantic. This is a part 11 of a multipart video series addressing the contributions of the US bombers during the WWII Battle of the Atlantic.