Deaf Divers

Just a minor observation. One thing that really impressed itself on me when I went scuba diving is just how low the communication bandwidth is while you're down there. There's a few hand signals and gestures you can use, to indicate things like "I'm okay" or "look at that", but you can't really communicate with the other people you're with (so I was kind a half jokingly thinking "so this is what it's like to be a creature like a dog or a cow without any real language..."). And all this made me think that if you and your dive buddy could sign, you'd be set.