- MrMassakka
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- Noble Legendary Member
OP, if you really want to go with the boring reality: Vents are usually not built large enough for people to crawl through. Especially not at well-guarded places.
But yeah, a space-ship needs vents as much as every underground-facility and after movie/videogame logic it's technically not illogical. However, they would not go anywhere outside. The ships would have to get their air from a limited ship-internal supply.
[Edited on 12.28.2012 8:51 PM PST]