Problem with Santen death...
I was watching the movie yet again and I realized something in the part where the men are just sitting or standing around HAB waiting for their air supply to run out.
They're still wearing their helmets, so they still had to be on the com system with each other. Wouldn't Gallagher and Burchenal have heard the conversation between Santen and Pettengill? So, wouldn't they have heard the argument between them?
The only thing I could think is that the com system is either line of sight or has a limited range.
What's everyone else's opinion?