It picks up ambient noises in the cockpit, switch movements, it picks up any noise, really. We can even analyze the frequency of the engines and determine how fast they were rotating by listening to the cockpit voice recorder.

Bob Benzon

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We know it was well over 100 times the force of gravity, based on the fact that the flight recorder is only guaranteed to 100 Gs and it broke.

The left-hand modulator valve was changed the Saturday prior to the accident. It's a routine maintenance type thing. It modulates bleed air from the engine that's used for air-conditioning and pressurization of the aircraft.

We removed the right engine from the crater and it's virtually intact. It's heavily damaged, of course, but not broken apart.

We could get quite a bit of information.

They're activated by pulling -- which breaks a little valve or wire or something up there -- and if all of them that we find happen to have broken wires, then that's a pretty good indication that they were deployed.