This is a part 10 of a multipart video series addressing the contributions of the US bombers during the WWII Battle of the Atlantic. The German Submarine fleet deployed Radar decoys and adopted radar detectors as countermeasures to allied patrolling aircraft. Submarine deployed Radar decoys included both Aphrodite balloons and Thesis buoys. The Metox and Naxos radar detectors will be reviewed. The combat effectiveness of these systems will be addressed.