Well, we went last Sunday and had a great time. We rented a pontoon boat from the dive center at the Port Motel and Marina in Crystal River. As before, the boat electric start ran flawlessly and the 4 cycle boat motor was nice and quiet.
We got to the nearby, in sight of the dock, King Springs. The visibility at the boat was maybe 15 feet, so I left my camera on board. As we neared the entrance of the "cavern," the vis improved a good bit, maybe to 20 or 25 feet. The are, on this Sunday at 10 AM, was crowded with divers, especially at or above the cavern entrance. Many mangrove or gray snapper were schooled and so were some things that looked like mullet and maybe sand trout.
After 20 minutes or so, I figure it would be like last trip: no manatees here but maybe at Three Sisters. Then we saw them, above us and near the margin of the permitted diving area: a mother and a calf swimming away. We began to explore these margins, where the bottom rose up to 10 or 15 feet, and came across a lot of them. Many were resting motionless. Maybe 1/3 had propellar scars. Some swam off, and we would swim along side.
Then, a bit later in a bit deeper water, away from the cavern, we came across a huge, white-looking manatee, seemingly asleep at maybe 20 feet. I turned on my side and stationed myself several feet away and watched. Sure enough, the began to lift off the bottom, ready for a breath of air. Keeping my distance, I swam on my side and parallel to the big beast as he swam along and up. Then he descended back down and just stopped. I could tell it was looking at me with the tiny eye in that huge body. So I held my hand out flat, at arm's length from me and a few feet from him.
The manatee came over and began rubbing along my hand just like a dog! So I began to pet it, and, as we were in 20 ft., it rolled over on its back, over me. so I could pet the top of its back. This went on for several minutes, with the manatee cleary enjoying the petting it had initiated.
Then it swam away.
That was the highlight of the trip.
By the time everybody was back on the boat, we realized we had all had a great time and that we didn't have time to dive at Three Sisters, too, before the boat was due back. But we motored back to the entrance to Three Sisters, and found the water crystal clear and crowded with many manatees of all sizes.
EDIT: Hi Donna! Just read your report above on our trip, after I composed and posted this. You hit the nail on the head!