This thread reminded me of what may have been the #1 freakiest (ocean) dive I ever did. I was working for Dive Cozumel, on the boat The Yellow Rose (best dive boat on the island).
On the 2nd dive of the trip, we went to Chanknaab Bolones (always a waste of time and air, IMO). The current, as it often did there, was running to the south, but this time it was SCREAMING !! It was hands down, the most hellacious current I'd ever seen in years of diving Cozumel, and our Cozumel veterans concurred.
Almost instantly, it started blowing divers across the bottom like tumbleweeds, and wrecking any group cohesiveness. Visibility was maybe 10-15 feet. I saw one diver lose a fin, and as i recall I somehow waved them on, signalling that I'd go after it, and grabbed something to stop me in the current. We never saw that fin again. I also completely lost the group.
I was flying along the bottom, trying to zig-zag a little, while looking for the fin, or the divers, almost running right into big coral formations in the ripping current and low visibility.
At one point, and big southern stingray pops up out of the sand right next to me, scaring the hell out of me, and right after that, a 5ft shark darts into view, then disappears. I had the impression he had his attention focused on the stingray, both of which instantly disappeared.
I finally decided I wasn't finding anyone, which was quite stressful, so I headed up, trying hard to do a slow accent and safety stop in the current and near zero vis, and when i got to the surface, the whole group was already on the boat.
Everyone was almost breathlessly chattering at mach-speed about their experiences, at which point someone points out the entire episode was only 15 minutes !!! (this was an operation that practically guaranteed an hour of bottom time, providing you had the air).
No one complained about the short duration, and everyone was kinda freaked out about the time distortion, because it felt to us all like at was much longer than that.
That bizarre dive was the big tale of the day back at the shop, and at dinner that night.