1. The Allies deployed acoustic mines , against which even wooden-minesweepers ) remained vulnerable. 2. HMS " Veteran " was damaged by an acoustic mine and required repair. 3. From October 1941, she swept acoustic mines off Harwich and the Isle of Wight. 4. On the return trip, " Queen Emma " was damaged by an acoustic mine . 5. During World War II he developed magnetic and acoustic mines for the British Admiralty. 6. She checked the harbor for acoustic mines , then carried cargo from Chinhae for Allied vessels at Fusan. 7. The first acoustic mines were deployed by the German navy in the Thames Estuary in October 1940. 8. He ignored the order and, " with improved security ", continued the development of the acoustic mine . 9. During this period, he was tasked with disposing of German acoustic mines in a number of British harbours. 10. So he started work on an acoustic mine that worked on the sound emitted by a ship's propeller.
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