Reasonable on 27 September 2009
A very good point, and one I noted too. But clearly they wanted us to 'see' the characters and for an easier difference between ISA and the Helghast. Still, I reckon you're right - they should have needed breathing equipment - I think some characters even talk about how the Helghast need breathing equipment to survive!
Just one of those things you're supposed to ignore, like most of Transformers 2 or the strange plot holes in Star Trek.
Try to be reasonable... its easier than you think...
