Avengers

[Black Aeronaut]

Ah, that would do it then. I was not aware of that. I will admit that I was the only person in my group that actually noticed that, though. Also, the design of the 3D glasses the theater used were rather poor (small lenses, frame pinched my head a bit too tightly), but that isn't the movie's fault.

Also, what was that dropping jail cell thing supposed to do when the ship isn't airborne, anyway?

Given that it is supposed to be tough enough to contain the Hulk (at least for a little bit) I'd say that it was heavy enough to sink.  That, or it floods the instant it hits the water.