| Clue | Source | Date |
|---|---|---|
| Line on a map connecting points of equal underwater depth (7) | Mirror Quiz | 11 Aug 2026 |
| Line on a map connecting points of equal underwater depth (7) | Mirror Quiz | 12 Jan 2026 |
| Line showing equal water depths is over tub | The Times Quick Cryptic | 03 Jan 2025 |
| Connector of equal ocean depths | ||
| Line on oceanographic maps |