A new digitally enhanced copy of my film of the 1972 British Expedition to the Gouffre de la Pierre St Martin, which features some of the finest British cavers of that era, pushing to the limits of exploration. On a personal level, I was disappointed with the film at the time and after the first television showing, did not have or see a copy for forty years, Eventually a series of events resulted in a fairly decent copy coming into my hands and the realisation that it was better than I remembered snd, warts and all, this was a landmark expedition that deserved to be recorded.