May 24, 2011 1:40:09 PM EDT
Hi Bonnie,
don't know Martin Farr either. He is a reference in sump diving and exploration, certainly knows his stuff!
On the other hand, think of the environment you'd like to dive the most. That way you will narrow down your search for a good instructor. If you plan to dive the sumps around the World, then Martin is probably your man. If you'd rather dive in the warm water of the cave of Mexico, I surely can help you find the best instructor for you.
Hope this helps :) and good luck with your training.