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I used to wear one of these Draeger rebreathers as a frogman. They are neutrally buoyant; the breathing bag balances the rest of the rig's weight. The little oxygen bottle can last about 3 hours under the right conditions. To become more buoyant, you just breathe in more oxygen from the bottle and exhale it into the breathing bag.

Now, I don't disagree with you in essence, that is, I'm not seeing a diver in the pictures. But you are wrong that a diver would necessarily have a heavy bottle on his back. A diver with a closed-circuit rebreather can easily maintain any depth from 30' down, to on the surface with his head exposed, simply by breathing more or less oxygen from the bottle into the breathing bag.

This is the chest-side of a Draeger, showing the breathing bag.

I'm so glad that you mentioned this (the Draeger).

I've been muttering about an earlier comment by somebody. Muttering because, I'm not so old yet, that I have forgotten diving and being comfortable in the water.

The earlier comment by somebody, attempted to intimidate butterdezillion under a guise of ostensibly attempting to come to her assistance; and that comment tried to convey that anything other than accepting, that, with a tank but no "flotation device," a person would quickly sink.

That's when I began to mutter; as I was certain, that I have seen a tank, plus minimal tank-mount-shoulder-and-waist attaching-points, plus mask-and-snorkel, and a body's native flotation capacity, plus the few bubbles that might have inhabited minimal-apparel ... all getting along just fine. Indeed, so well, that a weight belt would be required to control descent.

It would be no surprise to me, to find, that the aircraft crash-landing at sea, site, which was within swimming distance *for some of the aircraft's survivors,* would also be an area where any number of divers could be present. (It is, after all, Hawaii, where that probability is higher, than along the shores of the Missouri River or Red River, in December.)

I do not equate, diver and assassin, regarding the aircraft accident. I figure that the odds of a diver in the area, are pretty good. I figure that the odds of foul play, might be good, and evidence might be in the video and pic's related ... but insufficient evidence, for now, for me at least.

I figure that *everybody* in the water, could have not recorded in their minds, "Hey, there's a diver!" I also figure, that somebody could have noticed, something.

I also figure that the person taking the video (GoPro), might have been who "noticed something" and then pondered what butterdezillion observed, for some time, and then submitted his video to the news media, with the same notion, "What do you see?"