| Answer | Crossword Clue |
|---|---|
| SONARS | Underwater sound detectors |
| EARS | Sound detectors |
| EEK | Mouse detector's sound |
| SENSORS | Motion or sound detectors |
| SONAR | Underwater sound device |
| GASP | Sound from one who was underwater too long |
| fathometer | an instrument for measuring underwater depth using sound |
| fathometers | FATHOMETER, an instrument for measuring underwater depth using sound |
| pinger | a device for producing pulses of sound (as for marking an underwater site or detecting an underwater object) |
| pingers | a device for producing pulses of sound (as for marking an underwater site or detecting an underwater object) |
