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Hollow out a cannon projectile. Put live mouse inside. Shoot the the projectile 20 miles into a lake. Find the projectile. Open the projectile . Examine the mouse. Ha Ha Ha.

Okay, you say accelerate slowly... Fine. If the tube is not straight as a gun barrel, the passengers will be squeezed against the cabin walls by g-force during any bends in the tube.

Keep dreaming... Better yet... Buy their stock... Buy their licenses.