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An infinite flat surface would not work from a gravitational perspective as the surface would disintegrate under gravity into lots of small planets or if there was no rotational movement a single ever expanding black hole. So best to use a planet or Dyson ring. The habitability of the tunnels would depend on a lot of factors: the depth of the ocean, the ...


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Air Pressure Follows the Same Rules there as on Earth Atmospheric pressure is largely the effect of the amount and composition of gasses, and the effect of gravity on the gasses. Due to how fluid pressure works, the use of tunnels is largely irrelevant and can be safely ignored. Assuming your world is not infinite horizontally, but is rather arbitrarily ...


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