[fcallagy]

Noise on it may be a double edged sword as it may attract attention but might also tell your subconcious your still in danger and your subconcious says ok i,ll stay right where I am. From what I,ve read ( and i,m no expert ) in a black out the mind needs to be reassured that all is now safe again thats why shouting at an unconcious person isn,t recommended. An alert to your buddy would be handy to make them aware but don,t know anything about radio waves etc and whether they might scare off the fishies .