American, David Bushnell, 1776, the TURTLE; piloted by Sgt. Lee, American Continental Army.
Most submarines were made of steel.
As of now, the only African countries known to possess submarines are Egypt and Algeria. Egypt has several submarines, including German-made Type 209 submarines, while Algeria operates a fleet of Russian-made Kilo-class submarines. These countries have invested in submarine capabilities to enhance their naval power and security. Other African nations do not have operational submarines at this time.
Both sides, the Allies and the Axis, had submarines when WW2 started.
All submarines were built from steel. Except Bushnell's Turtle in 1776, that was made of wood & leather.
Steel or titanium
Submarines are made in many places all over the world
As of now, the African countries known to possess submarines include Egypt, which operates a fleet of submarines, and Algeria, which has a number of Russian-made submarines. South Africa also has submarines, specifically the Type 209 class. These nations have developed submarine capabilities primarily for strategic defense and regional security purposes.
the military and navy use it for war and combat. Many submarines are made for launching missels and taking down ships and other subs.
Submarines are used both for military and rersearch purposes.
Germany made the first submarines in WW1. They were called U-Boats, short for "unterseeboat" Most modern submarines are descended from The Holland, christened in 1897, invented by John Holland.
About 2,100 by many different countries.
Germany made its own submarines and had been doing that since the days of WW 1, long before Hitler.