Back to Sid's filmography: This film documents cave exploration under the Llangattock Mountain in South Wales, in particular in Ogof Daren Cilau and Ogof Craig A Ffynnon, although Ogof Agen Allwedd and Elm Hole are also featured. There are some groovy shots of the Hard Rock Café, and it climaxes with footage of Martyn Farr's historic dive which connected Daren Cilau with Elm Hole. Cavers featured include Andy Cave, Martyn Farr, Ann Franklin, Clive Gardener, Angela Garwood, Bill Gascoine, Arthur Millet, and John Parker. Sid Perou was the main underground cameraman. A version was broadcast on S4C on 5th July 1988 in Welsh, and this re-edited English version was first broadcast on 17th March 1989 on HTV. Extracts from it were also shown on 2nd March 2003 by HTV in a programme "Never to be Forgotten". Unfortunately, Youtube have muted the audio track for 'copyright reasons'.