Dirty Great Machines Titans of Tunneling (2012– ) Online
- Original Title :
- Titans of Tunneling
- Genre :
- TV Episode / Documentary
- Year :
- 2012–
- Directror :
- Will Aspinall
- Type :
- TV Episode
- Time :
- 45min
- Rating :
- 6.5/10
Take a trip underground and get up close and personal with titans of tunneling: the biggest, baddest tunnel boring machines on the planet. These monsters dig deeper and faster than ever before, gouging holes in the Earth's crust for subways and sewers.
| Episode cast overview: | |||
 | John Michie | - | Himself - Narrator (voice) |