The United States H-class submarines were Electric Boat design EB26A and EB26R design coastal patrol submarines used by the United States Navy.
USS H-1
The torpedo room of USS H-5 in 1919. The breeches of the four 18-inch (457 mm) torpedo tubes are at center.
The American Holland-class submarines, also AG class or A class, were Holland 602 type submarines used by the Imperial Russian and Soviet Navies in the early 20th century. The small submarines participated in the World War I Baltic Sea and Black Sea theatres and a handful of them also saw action during World War II.
AG-11, AG-12, AG-15, AG-16 and submarine tender Oland