Cessna 421 Unresponsive Over Gulf of Mexico

The bird in question ..

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They just confirmed the plane did go down in the Gulf. Still no word on the pilot or if it was a controlled ditch.
 
Wow. The track looks odd enough, but look at the graph of altitude and speed. Sounds and looks like maybe a decompression.

The up/down trend of the speed is it stalling and nosing over.

My former CP used to be in flight test for the Hawker program at HBC. They did a little experiment one day; an emergency descent with air brakes extended. They let the autopilot level off at 10,000 feet after a Mmo/Vmo dive. They left the air brakes extended and kept hands off to simulate two incapacitated pilots. When the plane leveled, it obviously slowed. When the stick shaker activated, the autopilot disengaged as designed, and the aircraft started into a parabolic pattern for the next 6 minutes (I think that's what he said; regardless, it did it for a LONG time) until they had to take over so as to not put themselves into an unrecoverable situation.
 
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