| Answer | Crossword Clue |
|---|---|
| SONAR | Device for locating underwater objects. |
| RADAR | Device for locating aircraft. |
| SONAR | Echo device for locating submarines. |
| LIMEYDETECTOR | Device used by the Spanish Armada for locating their enemy? |
| OTTER | Underwater device for severing mines. |
| PARAVANE | Device for protection from underwater mines. |
