Can anyone tell me about this?

[a64pilot]

The box was hollow, and water flowed within it. (I'm not sure what you meant by nothing changing from empty to full.) It was explained to me as the "first integrated buoyancy system," as it contained the cylinder, the wing, and the ditchable weights.

If I understood it correctly, the wing was inside of the "box", so wing empty, or wing full, the box of course didn't change shape or size, sort of like a submarine I suppose, drag etc. remained unchanged. I think this thing pre-dated Scuba Pro's Stab jacket? I mean it was this thing or the May West horse collar thing, I think, but as I was a teenager, it was way out of my price range

[NorthWoodsDiver]

We got these too, the yellow box actually has the triple cylinders and bands inside but the blue box is empty

[WEPIV]

Jordy Klein Sr., (who as far as I know still lives just south of Ocala along with his son Jr.), designed some of the underwater 007 gadgets and devices for "Thunderball."