suspension of disbelief is critical. there are a lot military and technical things in this that are a bit hard to swallow. Also a lot of {insert Techno babble here}. Narrator is okay, but tends to voice females as if they are always on the verge of Crying. But, as with a documentary that you have to wade through to find out how they survived, this does keep you attention. don’t know if I’ll spend the credit for the third, it’s a bit of a tossup.