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I read lots of material about diving with a buddy and see buddies who feel it perfectly ok to wander apart. I even had a DM do that with me....basically, we'll all just swarm around. With other divers entering the area, I had already started to do my one-minute look around before ascent. I recently read a post about the use of underwater lights to signal your buddy. It got me wondering....why would you need to do that if you were next to each other? If my buddy detoured to look at one thing and me another, how could we possibly help each other? So how close are you to your buddy?