Navy

See This Submarine? It Has Technology That Makes it Super Stealth (U.S. Navy Has None)

Several navies experimented with AIP during the twentieth century. The earliest work began in World War II in the German and Soviet navies, although none of the experiments produced operationally suitable boats. After the war Britain, the United States and the Soviet Union took advantage of German research to produce their own experimental boats, but nuclear propulsion seemed to offer a more fruitful direction for submarine development.

In the mid-2000s, converging technological developments enabled several major submarine producers around the world to begin to develop practical AIP systems. France, Germany, Japan, Sweden and China all laid down AIP-capable boats, in some cases exporting those submarines to customers around the world.