| Answer | Crossword Clue |
|---|---|
| GOPHERHOLE | Opening to an underground network |
| SEWER | Part of an underground network |
| ROOT | Part of an underground network? |
| GASMAIN | Part of an underground network |
| grating | a network of bars covering an opening |
| gratings | GRATING, a network of bars covering an opening |
| grille | a grating (a network of bars covering an opening) |
| grilles | GRILLE, a grating (a network of bars covering an opening) |
