| Answer | Crossword Clue |
|---|---|
| NET | Anti-submarine device. |
| SONAR | Submarine device |
| SONAR | Submarine device. |
| SNORKEL | Submarine device. |
| SONAR | Submarine-detecting device |
| SNORKEL | Submarine ventilation device |
| PERISCOPE | Tubular submarine device |
| SONAR | Submarine tracking device |
| SONAR | Submarine-locating device. |
| HYDROPHONE | Submarine detecting device |
| ASDIC | British submarine detection device. |
| SCHNORKEL | German name for a submarine device. |
| SNORKEL | Breathing device enabling protracted submarine immersion. |
