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Not sure if knowing you're actually still on Earth and can leave at any time affects it positively or negatively. What they can't really simulate is being absolutely stuck with no way out.
The best way to fix this would be 1) make the "spaceship" lava-proof and drop them in a volcano or 2) station the experiment in Oklahoma. Either way, they're guaranteed to not come out.
If they were in Oklahoma, wouldn't they be more likely to want to exit . . . sooner?