The situation underground is perilous for the trapped five and the pressure builds as truths, lies and confessions abound. Frank's adult life has come full circle, rat run to rat run.
Frank finds the brick he carved into all those years ago with his 35-year-old time capsule. But the overwhelming worry comes from the realisation that nobody knows where they are.
Desperate and worried, Karen searches for clues, while Gloria wrestles with her guilt over Jamie.
Shane's plans discovered, a search party is swiftly formed, but time isn't on their side and decisions have to be made whether to involve the authorities for help.
Billy and Shane are seen sat at a table in a completely blacked out room. Billy asks if Shane has any plans for the summer to which Shane replies with a story of how he would like to go "extreme camping" on a Safari. The conversation turns to Billy's plans, which turn out to be trying for another baby with Shane's mother Mimi. Billy soon makes the mistake of being too detailed about sex with Mimi, even going so far as to imitate her orgasm noise. Billy suddenly realizes his mistake when he sees Shane's face and after the screen goes black Billy's screams of pain can be heard.
- David Threlfall - Frank Gallagher
- Aaron McCusker - Jamie Maguire
- Rebecca Atkinson - Karen Maguire
- Nicky Evans - Shane Maguire
- Tina Malone - Mimi Tutton
- Michael Taylor - Billy Tutton
- Kari Corbett - Ruby Hepburn
- Karen Bryson - Avril Powell
- Emmanuel Ighodaro - Jackson Powell
- Kira Martin - Letitia Powell
- Qasim Akhtar - Chesney Karib
- Valerie Lilley - Patty Croker
- Robbie Conway - Aidan Croker
- Sally Carman - Kelly Maguire
- Alice Barry - Lillian Tyler
- Jack Deam - Marty Fisher
- Stephen Lord - Dominic Meak
- Angeline Ball - Gloria Meak
- Narrator: Frank Gallagher.
- Many elements of the story of this episode appear to be referencing the Chilean Mining Accident of 2010.
- This episode credited no guest cast, beyond regular extras only the main cast starred.
Jamie: Jackson! Stay where you are mate, we've got a huge problem in here! Billy: How unpopular are you, even buried people don't want to see you!