Iron Man vs. Megalodon

This fight takes place 10,000 feet underwater, both are blood lusted, however, Iron Man is only able to use H2H combat so no lasers or rockets. He is in his extremis armor. Megalodon has a bite force of over 16 tons (strongest bite force of any creature on Earth) and grew over 60 feet long.

Who wins?

vs.

I think Iron Man could do the ol "get swallowed intentionally" bit and do some major damage from inside.

@noone301994: Warning for mismatches. Basic research on Tony could have figured this out that even just using his physicals in the suit would be a walk in the park.