Welsh speakers (and people who can read subtitles!) might do much worse than watch S4C at 9pm tonight for the underground show in Iolo Williams' new series Tir Cymru; this features parts of Ogof Ffynnon Ddu and Dan Yr Ogof among others, and includes the filming work of one Gavin Newman.
http://www.s4c.co.uk/tircymru/e_programmes.shtml
http://www.s4c.co.uk/tircymru/e_gallery.shtml
http://www.s4c.co.uk/tircymru/e_programmes.shtml
http://www.s4c.co.uk/tircymru/e_gallery.shtml