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Originally posted by ArMaP
It moves like a fish (the changes in direction and what looks like fins on the top and bottom), it's underwater, so I suppose it's a fish.
(This time it's not a rock )
Fish are very fast (they are the animals with the fastest movements on Earth)
It looks like a light source in the middle with some sort of protection globe around it. It could be a fish overlayed with cgi but if you watch the globe when the vid goes to slow-mo the light source appears to be following or watching the scuba diver. then the light source circles back to the front and the globe speeds off.