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I wonder the kind of sensor package they fly to be able to get to this conclusion. I have a real passion for monitoring things (for me, mostly web apps and data/message flows) and this is a really interesting case.

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SpaceX is at least known to have some kind of high resolution/precision microphones around the structure recording constantly so that they are able to do 3D triangulation inside the vehicle.

Interesting, so they monitor the vehicle like it’s an earthquake

yes, it's also what helped them solve CRS-7

Seems to be as simple as a bunch of pressure sensors, in this case.

True, but add telemetry, and all other sensors who have shown nominal performance throughout the flight and that gave them the information they needed with the time resolution required to see an highly energetic cascading failure from one engine to the others.

It's a very interesting space (no pun intended).

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