Colin: You think they're gonna pay a bonus for bringing home an alien instead of core samples?
Sam Carter: And the last place you want to be is cooped up with a dozen of Norwegian guys.
Adam Finch: You know, I never believed in this shit.
Jonas: I always did.
Adam Finch: In the three years that I have known him, this is the most excited I have ever seen him.
Adam Finch: So, I'm gonna die because I floss?
Chosen answer: By disabling the snow vehicles, they are making sure that the creature can't use them to escape from the quarantine zone. Since the creature can assimilate anybody, it would probably know how to use one.