Deliberate mistake: There are no lights ever to be found in the underground world and the ceiling is literally the surface's ground, but there is still a perfect level of lighting regardless.
Beneath the Planet of the Apes (1970)
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Directed by: Ted Post
Starring: James Franciscus, Kim Hunter, Maurice Evans, Linda Harrison
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Trivia: A bullet from a rifle Charlton Heston owned was the inspiration for the design of the Alpha-Omega Bomb.
Chosen answer: It's never explained. The ship had gone through a time warp and that may have rendered it inoperable once it arrived at the new time destination.
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