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this post was submitted on 16 Jan 2024
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I'd do the math on how much thrust you'd get out of sticking one portal at the bottom of the Mariana Trench and the other in a ship, but I think it'd maybe be slightly tricky because you've got yourself an inertialess thruster right there, which is slightly illegal according to physics.
The Einstein cops are gonna show up and impound your spaceship
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I think Niven once wrote an essay on this, in the context of teleportation booths. He posited that conservation of energy would be satisfied by temperature changes. In this example, the water would come out of the portal at cryogenic temperatures.