Most submarine hulls are built of steel. Recall that a submarine is not usually considered one of the little robotic undersea machines, or a manned vessel that is operated off a support vessel. We usually reserve the term for the military submarines (boats) that put to sea for extended periods of independent operation.
The Russians built a few hulls from titanium, but these boats were horrendously expensive and in so many ways were not cost effective. The lion's share of modern military boats are steel hulls with steel decks (on special supports) and filled with tons of equipment built largely of steel or other metal alloys. The modern nuclear submarines include the reactor, which has a steel pressure vessel and steel Plumbing pretty much throughout the ship.
The Perla class submarine was built for the Italian Navy in 1930. The submarine was built by Italy and designed by Bernadis in commission in 1936-1954.
where was the first submarine built
It was a French submarine built in 1863.
the turtle was built in 1775
Groton
The first submarine built for the South was named the Pioneer. It was built in 1861 in New Orleans by James McClintock and Baxtor Watson.
It was built in Germany, Italy, Spain, and England
Cornelius Drebbel in 1622
The USS Nautilus was built in Groton, Connecticut.
David Bushnell .
The Russian Navy built the Typhoon
USS Seawolf