what is the bottom of the ocean but a blueish green humid day?
I am experimenting with animated gif files. If you do a search there are some amazing ones around. Underwater is quiet but there are still lots of sounds, snapping shrimps are most audible. When whales arrive, there goes the neighborhood. They are a noisome bunch in a very good way. Try it, hold your breath and stick your head in the water. Forget scuba: too noisy and scares away animal.