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Depends on which end of the diver the bubbles are coming from. Avoid any problems- do not bite at them.
Aside from the photo problems that Doubler mentioned, there is one huge problem in some specific cases...
If you are running along shallow on a vertical wall and others below are in front of you- there will be cascading plumes of silt/sand loosened by their exhaust. They will never see it- unless they turn around and look upwards. You will be immersed in it. Makes pictures even more difficult.
I tend to stay shallower than most, so if you train yourself to recognize bubble streams of others, it makes it easier to keep track of them- even if they are "over the edge" on a wall dive.
Aside from the photo problems that Doubler mentioned, there is one huge problem in some specific cases...
If you are running along shallow on a vertical wall and others below are in front of you- there will be cascading plumes of silt/sand loosened by their exhaust. They will never see it- unless they turn around and look upwards. You will be immersed in it. Makes pictures even more difficult.
I tend to stay shallower than most, so if you train yourself to recognize bubble streams of others, it makes it easier to keep track of them- even if they are "over the edge" on a wall dive.