Documentary providing a rare glimpse into the depths of the London Underground as its staff strive under immense pressure to keep this hugely complex and strained system running. The programme uses anonymous accounts by staff members, voiced by actors.
| Actor | Role |
|---|---|
| DDennis BanksDennis - Track Maintenance | Dennis - Track Maintenance |
| DDaniel GodwardDan - Controller(as Dan Godward) | Dan - Controller(as Dan Godward) |
 David MumeniDavid - Station Staff | David - Station Staff |
| PPatricia Gibson-HowellPatricia - Station Staff | Patricia - Station Staff |
| JJohn Henry KeatingJohn - Driver | John - Driver |
| RRay NeweRay - Signal Engineer | Ray - Signal Engineer |
| RRosemary SmithRosemary - Station Supervisor | Rosemary - Station Supervisor |
 Pete Lee-WilsonPete - Station Staff | Pete - Station Staff |
| CChinna WoduChinna Emergency - Response Unit | Chinna Emergency - Response Unit |
 Richard WilsonSelf - Narrator(voice) | Self - Narrator(voice) |
| EEmily Renshaw-SmithSelf - Additional Voiceover(voice) | Self - Additional Voiceover(voice) |