grey2112
Contributor
Techniques, basic lessons, advanced discussions, training excercises, etc.? Something you could have both an experienced but also beginner learn from and use during the times they aren't on the water?
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Second the NOAA manual and the US NAVY Dive Manual that you can download for free. Also the Tao of Survival Underwater is one I recommend to every one beyond the OW level. Along with the Six Skills and the SDI Solo Diver Manual.
I wrote one myself that's pretty good too based on what a few people have said.