The dive did start oddly, with us in freshwater springs that made for a halocline. The resulting lack of visibility resembled turbulence, but it was just the mixing of salt and fresh.
And in my case, you dive within a few hundred yards of a mother whale and her calf. Visibility was about 60 feet, so we didn't see them underwater, but I heard the mother and calf singing and speaking the whole time I was underwater. It's an unmistakable sound, and made a heck of a soundtrack for diving.
Recent sea life spotted: a swarm of needlefish, a trumpetfish, a razor fish, nine sea turtles, and the usual assortment of colorful stripes and spots, including the reef trigger fish. The razor fish is an odd one, apparently a very rare breed, with a sort of horn or lure projecting from its forehead. The other divers were very excited by this one, but I didn't know what all the fuss was about until we got to the surface.