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Related Clues:
- Red October detector
- Ping maker
- School-searching tool
- Aid in finding sunken ships
- Fishing-boat accessory
- Sub apparatus
- Ship tracker
- Dolphin sense
- Thin strips of wood or glass
- Device for detecting objects used in arson
- Device for detecting objects under water with sound waves
- Underwater echo sounder
- Thus one hurried up to get the echo
- Thus one hurried up with the help of an echo
- Does your boy get the artist back to help with the navigation?