| Answer | Crossword Clue |
|---|---|
| CATACOMB | Part of Rome's underground |
| ROOT | Part of the underground? |
| GASMAIN | Part of an underground network |
| SEWER | Part of an underground network |
| ROOT | Part of an underground network? |
| ORE | Part of the underground economy? |
| ROOT | Underground part of a plant |
| IRISHPOTATO | Part of an underground spring crop |
| IRT | Part of N. Y. C.'s "Underground." |
| hypogea | the underground part of a building, as a vault |
| stigmarian | the pitted underground part of Sigillaria or other fossil tree |
| stigmarians | STIGMARIAN, the pitted underground part of Sigillaria or other fossil tree |
