| Clue | Source | Date |
|---|---|---|
| Underwater construction worker | Family Time | 02 Aug 2021 |
| Tunnel worker | ||
| Tunnel digger | Thomas Joseph | 02 Aug 2018 |
| Underwater-tunnel digger | ||
| Tunnel digger | ||
| Subway excavator | ||
| Tunnel worker | ||
| Tunnel digger | ||
| Tunnel worker: Slang. | ||
| Tunnel digger. | ||
| Tunnel worker. | ||
| He works under rivers. |