What Happened To The Missing Plane

Now that authorities have confirmed that a piece of debris found on the French island of Reunion is part of missing Malaysia Airlines Flight 370, I want to share my longstanding theory of what happened to the plane, which I have withheld thus far rather than join in the unseemly parade of amateurs and self-styled experts who claimed to have cracked the case. Anyway, my belief is that the plane somehow sank into the waters of Indian Ocean. More than that I am not prepared to speculate, but this is what both my mind and gut tell me, at least.