http://www.advanceddivermagazine.com/articles/farr/farr.html Interview with Martyn Farr in Advance Diver Magazine (US)] Martyn Farr writes about diving the caves beneath Australia's Nullarbor Plain in Diver Magazine (UK) Farr has also acted as support diver in some of the world's most notable cave diving penetrations, including the British-led expedition to Pozo Azul in Spain in September 2010, which at 8 kilometers of underwater travel is the world's longest cave diving penetration. [