| Answer | Crossword Clue |
|---|---|
| burrowing | Advance into or through something solid by digging or making a hole |
| burrowed | Advance into or through something solid by digging or making a hole |
| perforations | A hole made by boring or piercing; an aperture passing through or into something |
| perforation | A hole made by boring or piercing; an aperture passing through or into something |
| penetration | The action or process of making a way through or into something |
