The Tether lines are so you don't have to constantly swim against the current.
Its like a standard drift dive, But the tether hooks will be placed along the dive route.
Allowing you stop and take pictures or look around without sucking through all your air fighting the current.

You are right, he really is a meticulous photographer.

David would be happy to know so many people here have enjoyed and admired his photographs.

Anthony

Photos are very bright and beautiful, congratulations! Recently I found the article underwater photography tips http://fixthephoto.com/blog/photo-ti...aphy-tips.html maybe it will be useful to you! Let me know if you liked it!

Anthony, do you ahve a new link? That old one is giving a 404 Page not Found.