Documentary about the tube, the world's oldest underground system, with its own unwritten rules of behaviour and protocol, and used by three million passengers every day.
| Actor | Role |
|---|---|
 Andy SerkisThe Driver (Narrator) | The Driver (Narrator) |
| ZZoe TeversonMother | Mother |
| DDarius TeversonChild | Child |
| AAnnie MoleSelf - Going Underground Website Creator | Self - Going Underground Website Creator |
| PPeter CollettSelf - Behavioural Psychologist | Self - Behavioural Psychologist |
| TTed BatchelorSelf - Lost Property Officer | Self - Lost Property Officer |
| NNigel AshcroftBusker | Busker |
| DDiego RojasBusker | Busker |