A friend of mine asked me today if there were any books or other reading material on DIR diving -- and I don't really know the answer. Are there?
There are the older GUE books, but is there anything printed about What Is DIR Diving, How Do You Dive DIR, etc.
My friend is very interested in taking UTD Essentials and just wants more information.
Suggestions?
There are the older GUE books, but is there anything printed about What Is DIR Diving, How Do You Dive DIR, etc.
My friend is very interested in taking UTD Essentials and just wants more information.
Suggestions?