Line of Duty Wiki

"Snake Pit" is the third episode in Series 3 of Line of Duty and the fourteenth overall episode. It was first broadcast on BBC Two on 7th April 2016.


DS Steve Arnott believes there is a dark secret in Danny Waldron's past. But while DI Cottan is commended for cracking the Waldron case, the spotlight falls on Arnott's questionable conduct in a previous enquiry. 


Part I[]

Main article: Snake Pit Recap Part I

Part II[]

Main article: Snake Pit Recap Part II


Opening Credits[]

Closing Credits[]


  • Chrissie Harris as Police Officer AC-12
  • Hugh Irvine as Crime Scene Investigator (CSI) Burslem
  • Simon Millar as Cameraman
  • Kristy Robinson as PC Karen Black
  • Ash Cook as Young Joe Nash
  • Terry Noble as Dale Roach


Filming locations in this episode include Invest Northern Ireland HQ and Belfast BT Riverside Tower (AC-12 Building), Royal Courts of Justice (courtrooms) and Albert Memorial Clock (underpass).