It varies with size, not quite exponentially (short of a cubic factor), but much greater than linearly.
The current Virginia class of U.S. attack submarines, nuclear-powered, displace 7800 tons submerged, according to the official U.S. Navy
.
The world's largest submarine, to date, the CIS Typhoonclass, also nuclear-powered, (Depicted as the RED OCTOBER in the movies) displace about 48,000 tons.
The German-designed Type 205 class submarine, diesel-electric in use in several navies displaces about 450 tons.
There have been many sizes of submarine from the tiny British X-boats weighing about 6 tons to huge 'boomers' weighing over 8,000 tons
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Modern submarines are designed to go much faster submerged. This design also limits their surface speed capability. WW1 and WW2 submarines were not considered true submersibles by today's standards. They were essentially surface vessels that had the capability of limited submerged operations. As such, their design and propulsion made them faster on the surface and much slower underwater. Modern submarines are true submersibles in that their only limitation is that of their crews.
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