A diver that flounders and makes flapping motions in the water to maintain
buoyancy, especially while exhaling a constant stream of bubbles,
will scare away the marine life. Consider the images below.
Unlike many fish that will actually swim towards a relaxed diver
in curiosity, both subjects below are extremely timid. The basslet
typically darts into a nearby crevice, and the feather duster worm
retreats into its tube when a diver approaches.
Feather Duster Worm
The key to getting these shots was
patience. I approached both subjects slowly, settled
myself down in the sand on my knees, and waited. And waited. And
waited some more --all the while breathing very slowly to minimize
bubbles. Eventually both subjects "presented" themselves
to me for the shot.
This approach doesn't necessarily
mean that I never swim towards a subject. Obviously I need
to get close to my subjects to photograph them, but I never
chase after them.