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The New Virginia Class attack submarine are the most advanced subs in the world and there deployed from the U.S.A.
the US has the largest standing army in the world and has access to some of the worlds most advanced technology
During the cold war (1945-1990) the Soviets probably had the largest sub force.
advanced technology
During WWII the largest submarine was the Japanese I-400 Class sub. It was 400 feet long, displaced 6,000 tons, carried 3 airplanes, and had a complement of 144 officers and men.
The USS Nautilus (SSN-571) was the US Navy's first nuclear powered submarine.
As regards military submarines meant as warships, the Russians built the submarines with the deepest diving capability, but U.S. submarines generally make less noise.
In "The Hunt for Red October," the name of the Soviet submarine is the Red October. It is a highly advanced Typhoon-class submarine equipped with stealth technology and a unique propulsion system. The film, based on Tom Clancy's novel, follows the submarine's journey as it attempts to defect to the United States.
Submarine pioneer John P. Holland was the first to apply for and receive patents on his successful submarine technology in the late 1800's. His designs and technology, though they've been advanced over the years, essentially remain the same in principle of design today.
Yes, the Nautilus was a submarine famously captained by Nemo in Jules Verne's novel "20,000 Leagues Under the Sea." The Nautilus was a fictional, advanced vessel designed for deep-sea exploration and adventures.
The Confederate States most successful submarine was the H L Hunley