Reporters Dan Ashby and Lucy Taylor visit the film star Michael Sheen - who recorded the witness's final account - and hear how he fell into a rabbit hole. They also discover Douglas Gowan's unpublished chemical test results. Are people in danger?

Buried is the award-winning true-crime series digging into some of the most disturbing environmental stories in history. In this new investigation, Dan and Lucy dig into the unseen files of a man who said he was beaten up and put under police protection, after alleging that a chemical had contaminated the food chain.

Produced and presented by Dan Ashby and Lucy Taylor
Research by Georgie Styles
Sound design and mixing by Jarek Zaba
Original music and sounds by Phil Channell
Executive Producers: Philip Abrams and Anita Elash
Commissioning Editor: Dan Clarke

A Smoke Trail production for BBC Radio 4