It seems odd to me that in a person with no history of cardiac problems, they keep hammering on the arrhythmia thing. Lots of people live for a long time with arrhythmia, even untreated, but first off, to determine rhythm in a heartbeat, you have to have one.
I don't see how that could be determined from stopped heart.
But arrhythmia (like tachycardia or bradycardia) can be induced.
The first thing that came to mind were the butyl/amyl nitrate drugs, liquid form, inhaled, sudden and strong effect on cardiac function, and I question whether there would be enough left to do a tox screen on (especially after a couple of days.
Then there is the old prussic acid standby, which also does not show in autopsy.
Neither drug would give long for anyone to so much as squawk, both could be administered in the water, and the remainder allowed to sink or drift away.
No evidence, sudden death mimicking heart failure, and a sanitized tale for the tourists. Those on board (with one or two exceptions) need not ever know anything.
But the people in the plane did know something was going on. There’s a still shot of Jacob Key - with his watch on his wrist - holding onto an extremely dark-skinned guy with black eyewear just below the water’s surface (the skin of this extra person was so dark that Jacob’s arm looks really light by comparison).
I could show you similar images for the others too - where the passengers from the plane had to be aware of the presence of this other person. For instance, what everybody thinks is the shirt of the guy standing on the plane’s steps is actually the back of the head of a guy who seemed to be looking out for Rosa. He was right behind her. He’s wearing a maroon tearaway t-shirt with a white tag. When you look at the whole sequence you can see him moving about, turning, surfacing and going under again. He’s right there by Rosa.
There’s stuff like that for just about everybody who was a passenger on that plane. I was hoping people would look for themselves at the slowed-down frames and catch this stuff, but I suppose ABC’s pixelation makes it too hard to tell what you’re seeing.
Anyway, it seems evident to me that they all knew something was going on. So whatever they were doing, it very much seems like they did it with the knowledge of everybody there.