What if the fire both caused decompression AND cut oxygen to the pilots, or greatly reduced it? You go “Oh shit”, accidentally go up, then think about it, and go “oh shit”, and drop altitude as fast as you can, while turning back to land. You die from lack of oxygen. Your door is locked. After thirty minutes, everyone else’s oxygen runs out and they die too. The plane keeps flying and eventually crashes somewhere deep.
Now, I have no idea what the situation is as far as cell phone service. If they could, presumably passengers would have called people. Technically, and this is a question someone somewhere knows the answer to, could cell phones have shown active while people were unable to make calls? I ask this as there is no reason to discount the many reports that cell phones were showing active long after they lost contact with the plane. Depending on the fuel load, the plane could have flown for another 20 hours.
Or what if the fire cut oxygen to the WHOLE plane? Everyone would have died quickly.
I continue to believe my first hunch–the ghost ship–best explains the available data.
Here’s another pilot saying more or less the same thing: http://www.hellou.com/2014/03/veteran-pilot-explains-theory-flight-mh370-makes-perfect-sense-3147/