- Beneath the waves
- Submarine
- Skids, as a car on a wet road
- Submarine’s fins
- A repair or re-equipping
- Equip again
- Liner refurbishment
- Newly equip
- Overhaul
- Refurbish
- Renovate (ship)
- Boy with a radical navigation system
- Echo location device
- Echo sounder
- Echo sounding equipment
- Navigation device
- Of sound
- Submarine detection system