What physical limitations dictated that the *Nautilus* could only operate for short periods underwater?

Answer

The mechanical reliance on human power for propulsion and moving water.

Because propulsion and managing buoyancy relied solely on the physical effort of the crew cranking mechanisms and operating pumps, the vessel's endurance and speed were severely restricted.

What physical limitations dictated that the *Nautilus* could only operate for short periods underwater?

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Robert Fulton: Submarines, Mines, and Torpedoes - YouTube

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