| Answer | Crossword Clue |
|---|---|
| SONAR | Sea salvage aid |
| SONAR | Salvage aid |
| SONAR | Deep-sea fishing aid |
| ecosphere | the part of the atmosphere in which it is possible to breathe normally without aid: the portion of the troposphere from sea level to an altitude of about 13,000 ft. (4000 m) |
