I am sure this has been discussed before. I looked around a bit, but didn't see too much. I agree 100% about out of air, getting snagged, or possibly helping with a narced diver. The deeper you go the more difficult help could be to recieve. If your 100 or heck 40 feet feet and have a stroke, or other health related issue how much could a buddy really do? I forgot the statistics, but don't the majority of divers drown in a mere 30ft of water? I realize the deeper you are the closer you should be.... Just wondering your typical insta buddy for example. Even in an air out situation at 100 feet, at least in the experience I've had with insta buddies I think the majority would'nt be too much help.