If it broke up so severely, surely plenty of stuff on board would float... there's so much plastic inside a plane...
Yeah, stuff would/should. I was being facetious
. If debris exist, there should be found, though difficulty really will depend on severity of the damage and crash location, something they appear not to know at this point.
Can pilot turns off those transmission? Or were those automated and ties to the plane system?
I figure they can, but I don't know. I'm not knowledgeable on the technical specifics, just that these state of the art commercial airliners are more realistically appreciated for their communication and tracking technology than the hyperbolic "unsinkable"-like title that flies around. Of course commercial airliners can fail, are subject to technical and structural issues, wrestle with human error, and can and will drop out of the sky due to the multitude of variables at play, even if these events are extremely rare (tldr; there's no absolutes in safety). But what these aircraft do have is technology aimed at providing people with
some kind of data when disasters do happen. Black boxes are a pain to recover, but there's more than that, and most should have complex backup systems to provide data, if just a little bit, even in most severe situations.
I assume pilots have that level of control, but I could be wrong.
This.
If the pilots were in control enough to attempt a "landing" on the sea in a way that didn't break the airplane up into a million pieces you'd have expected them to transmit a distress signal + coordinates.
If it happened quickly (explosion) you'd expect there to be plenty of debris floating around in the sea.
Yeah, and that's the mystery; we've (the public) got nothing, which is why I think extrapolating too much into extreme theories is, at this point, letting imaginations override logic. Anything is possible, but when faced with the absence of evidence you do not have evidence to support any theory more than another. Terrorism, structural failure, fire, military strike, pilot suicide, etc. All theories are valid, and by extension empty, because we've got nothing to support any of them.