Well, I'm in.
I'll go with heat in the containment vessel leading to chemical reactions producing hydrogen. Don't know a thing about it, but sounds reasonable.
But then, in order to avoid pressure build up they vented the containment vessel into the interior of the reactor building? Duh. That makes no sense, it's asking for an explosion.
Also, videos of the explosions at reactors 1 and 3 are radically different. The explosion at reactor 3 shoots straight up. The only explanation for the difference I've seen is that the reactor 3 explosion originated underground. The best info, and most knowledgeable people, I've seen seen on the subject is the Stormfront forum, but I'm banned there so can't ask questions :<. Getting an idea of what going on from MSM seems impossible, nobody knows nothing.
One other thing ... I've seen maps showing radiation reading at the measuring stations in Japan, but the areas around the reactors is .... not present, being calibrated, some sort of excuse. I'm wondering if current readings are available.