| Answer | Crossword Clue |
|---|---|
| tunnelers | TUNNELER, one that tunnels |
| tunneller | one who tunnels also TUNNELER |
| tunnellers | TUNNELLER, one who tunnels also TUNNELER |
| tunneler | one that tunnels |
| PRAIRIEDOG | Plains animal that tunnels |
| IGLOOS | Houses that may include tunnels |
| ELM | Tree that can form natural tunnels |
| sappers | soldier employed in the construction of fortifications, trenches, or tunnels that approach or undermine enemy positions |
