I didn't think this was a great SF movie. Good they got Scott Manley do design the spacecraft but the personal dynamics were completely unrealistic. Why didn't the stowaway volunteer to go up at the end to turn the valve?he was definitely not mission critical and the others were. It didn't make any sense. All it proved was that his character was completely selfish, as he was in the first place by becoming a stowaway. Nothing heroic in him at all and it just left me wondering how deluded Zoe was to give her life up for him.