This probably sounds ridiculous, and maybe it is...but I was just wondering if there would be any problems, either in principle or practice, with attaching some long (maybe 10 ft of something lightweight and positively buoyant) tubing to regulator vents (I/m thinking something like latex tubing) in order to divert the bubble stream far enough away from whatever you are trying to take pictures of or otherwise observe, in order not to spook it/them. Just curious.
Dave
Dave