Grumpy Scot

Revealing mistake: It's painfully apparent that the actors are hung on wires pretending to swim while outside the sub.

Grumpy Scot

Factual error: Proteus refills its air supply in the lungs. The lungs are filled with normal sized oxygen molecules. How are they supposed to breathe them? (In the book, they had a miniaturizer on the sub, but there is nothing in the movie to explain this.)

Grumpy Scot