Michael Mosley is doing a series on The Brain: A  Secret History. I had recorded it and last night it was on emotions and yes, the first was fear engendered in our intrepid presenter by being shoved into some tight stuff in Goatchurch. The voice of his guide was very familiar and so was the face:  Mendip's very own Andy Sparrow. Last time Michael was underground was at the bottom of Carlsbad with Hazel Barton - slightly larger passage than Goatchurch.

First shown in 2011, it's from 2 min in (did nobody notice he was wearing gloves on wrong hands?):
https://www.bbc.co.uk/iplayer/episode/b00x7cb5/the-brain-a-secret-history-2-emotions

Mike