Now I'm not sure where I read it, but I believe that the Hulk has a mega pair of lungs and he can breathe under water for a very long time. How? Heay have a big pair of lungs etc, but he has to provide oxygen to a vast body with powerful muscles. Surely his lungs would work like normal, having the capacity only to supply the body. I'm sure there's some perfectly good scientific theory which highlights what a complete load of bolloxs I'm talking, but I'm curious, as this seems like an anomaly to me.