Corrected entry: In the scene where we see Iron Man soldering underwater, the sound of his breathing is that of an open circuit breathing system, which should be releasing bubbles into the water, but none are visible (a rebreather wouldn't release bubbles, but sounds very different).
lightydo
4th May 2012
Correction: The Iron Man suit is completely fictional technology. Who's to say what it should or shouldn't sound like?
Phixius ★