A starship that might actually get live people to another star in 100 years? That's... a bit of a challenge. We have only the barest clue *today* how to go about building a self-contained structure that could get live people to a spot it never moved from, 100 years later.
So even "it's all a hoax, it's really a glorified fallout shelter" isn't all that plausible.
"It's secretly an alien zoo ship" would actually be the most believable for me.
But if it's a hoaxed ship, the self-contained environmental system doesn't have to be self contained. Just rig up some black-box technobabble water and air treatment system that amazingly never breaks down and only has to have the filters replaced once a year. They just don't see that the pipes go into the black box and make a right turn to the water treatment plant and air vents on the surface.
If it's got a life support system for hundreds of people, it's likely to have a truly vast number of pipes and valves and boxes and tubes and tanks... Stuff that doesn't break down can go un-messed-with and unnoticed pretty much forever.
The best place to hide a needle is in a stack of needles.
I was thinking more "Gosh, these humans are likely to blow up their planet and go extinct in the wild. If we want to preserve a viable population, we better act now. But let's put them in an environment that makes sense to them, so they don't freak."
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So even "it's all a hoax, it's really a glorified fallout shelter" isn't all that plausible.
"It's secretly an alien zoo ship" would actually be the most believable for me.
But then I'm very far from the target audience.
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The best place to hide a needle is in a stack of needles.
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