The 2 most advanced submarines currently in service are the U.S. Virginia-class and the British Astute-class fast-attack submarines. Both are technologically comparable in capability.
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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
advanced technology
During the cold war (1945-1990) the Soviets probably had the largest sub force.
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.
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.
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.
The lock to modern air combat would most likely be the United States of America. With one of the worlds largest and strongest militaries in the world, it is considered the most technologically advanced in aeronautics.
The Confederate States most successful submarine was the H L Hunley