| Rating | Solver | Clue |
|---|---|---|
| SUBWAY | Underground passage | |
| TUNNEL | Underground passage | |
| MILL | A passage underground through which ore is shot. | |
| BACK | The upper part of a lode, or the roof of a horizontal underground passage. | |
| ROOFING | The wedging, as of a horse or car, against the top of an underground passage. | |