The Darkness Beckons
1991 · Martyn Farr
Darkworld- the Secrets of Llang
1998 · Farr
The Secret World of Porth Yr Ogof
1998 · Martyn Farr
Underground Wales
2001 · Martyn Farr
Dan Yr Ogof
1999 · Martyn Farr
Classic Darksite Diving
2013 · Martyn Farr
