Sorry but I disagree with you on the subject of the submarine, Stauffenberg.
During the American Civil War, the Union Navy built a submarine before the H.L. Hunley (CSA). It was
Alligator.
Anyway, two submarines, both launched in September 1888, marked the maturing of naval submarine technology.
One was the Peral Submarine, launched by the Spanish Navy

. It had two torpedoes, new air systems, hull shape, propeller, and cruciform external controls anticipating much later designs. Peral was the first all-electrical powered submarine. After two years of trials the project was scrapped by naval officialdom that cited concerns over the short range permitted by its batteries.
The other was the Gymnote, launched by the French Navy. Gymnote was also an electrically powered and fully functional military submarine. It completed over 2,000 successful dives using a 204-cell battery. Although she was scrapped for her limited range her side hydroplanes became the standard for future submarine designs.
Many more designs were built at this time by various inventors, but submarines were not put into service by navies until 1900.
Regards!
