| TAKESOUNDINGS | Measure depths of water (4,9) |
| FATHOM | Unit of length of six feet used to measure depths of water (6) |
| FATHOMS | Units of length each equal to six feet, used to measure depths of water (7) |
| PLUMB | Measure (depth of water) |
| PLUMBBOBS | From the Latin for "lead", weights of said element or other metal placed at the ends of lines for determining verticality or the depths of water (5,4) |
| SOUND | Measure depth of safe inlet of the sea |
| DRAUGHT | A current of cool air; a quantity drunk in one breath; a catch of fish; depth of water needed to float a ship; a sketch; or, a dose of medicine (7) |
| SOUNDING | Determination of the depth of water (8) |
| LEADSMEN | Sailors who measure the depth of water |
| ECHOSOUNDING | Method of finding the depth of water (4-8) |
| SOUNDWAVES | Oceanographers use them to measure depth |
| GNOME | One of a species of legendary creatures said to live in the depths of the earth and guard buried tre |
| NADIR | Depths of drain in need of repair (5) |
| DIPSTICK | Does it measure the depth of water for bathing (8) |
| SONAR | Equipment on ship measuring depth of water |
| BATHYMETRY | The science of measuring (sounding) the depths of seas and lakes (10) |
| PLUMBED | Tested the depths of prize on the bottom of the river (7) |
| SANDY | The Knysna seahorse lives at depths of 50cm to 8m, on ___ bottoms or around clumps of plants |
| COCKLESOFTHEHEART | Depths of feelings of centrally placed molluscs? (7,2,3,5) |
| TRAWL | A dragnet; an act of fishing along the seabed with said bag- or sock-shaped seine; thus, a thorough comb, fish or search for information, whether on the Net or in the depths of one's brain (5) |
