The Type 212A is a class of diesel-electric submarine developed by Howaldtswerke-Deutsche Werft AG (HDW) for the German Navy, and the Italian Navy where it is known as the Todaro class. It features diesel propulsion and an additional air-independent propulsion (AIP) system using Siemens proton-exchange membrane (PEM) compressed hydrogen fuel cells. The submarines can operate at high speed on diesel power or switch to the AIP system for silent slow cruising, staying submerged for up to three weeks with little exhaust heat. The system is also said to be vibration-free and virtually undetectable.
An attack submarine or hunter-killer submarine is a submarine specifically designed for the purpose of attacking and sinking other submarines, surface combatants and merchant vessels. In the Soviet and Russian navies they were and are called "multi-purpose submarines". They are also used to protect friendly surface combatants and missile submarines. Some attack subs are also armed with cruise missiles, increasing the scope of their potential missions to include land targets.
The Greater Underwater Propulsion Power Program (GUPPY) was initiated by the United States Navy after World War II to improve the submerged speed, maneuverability, and endurance of its submarines. (The "Y" in the acronym was added for pronounceability.)
The Balao class was a design of United States Navy submarine used during World War II, and with 120 boats completed, the largest class of submarines in the United States Navy. An improvement on the earlier Gato class, the boats had slight internal differences. The most significant improvement was the use of thicker, higher yield strength steel in the pressure hull skins and frames, which increased their test depth to 400 feet (120 m). Tang actually achieved a depth of 612 ft (187 m) during a test dive, and exceeded that test depth when taking on water in the forward torpedo room while evading a destroyer.
Tench-class submarines were a type of submarine built for the United States Navy (USN) between 1944 and 1951. They were an improvement over the Gato and Balao classes, only about 35 to 40 tons larger, but more strongly built and with a slightly improved internal layout. One of the ballast tanks was converted to carry fuel, increasing range from 11,000 nautical miles to 16,000 nautical miles. This improvement was also made on some boats of the previous two classes. Further improvements were made beginning with SS-435, which are sometimes referred to as the Corsair class. Initial plans called for 80 to be built, but 51 were cancelled in 1944 and 1945 when it became apparent that they would not be needed to defeat Japan. The remaining 29 were commissioned between October 1944 (Tench) and February 1951 (Grenadier). The last submarine of the Tench class, as well as the last submarine which served during World War II, remaining in service with the U.S. Navy was USS Tigrone (AGSS-419) which was decommissioned on 27 June 1975.
USS Charger (CVE-30) was an escort carrier of the United States Navy during World War II converted from a commercial C3-P&C cargo/passenger liner hull built as Rio de la Plata intended for the Moore-McCormack company's American Republics Line serving the east coast of South America. The ship was requisitioned for conversion to an escort carrier type intended for Royal Navy use and initially commissioned as HMS Charger (D27). Days later the transfer was rescinded with the ship returning to U.S. Navy control to become USS Charger which operated throughout the war as a training ship on the Chesapeake Bay with two ferry missions to Bermuda and Guantánamo Bay, Cuba.
The Argentine Navy is the navy of Argentina. It is one of the three branches of the Armed Forces of the Argentine Republic, together with the Army and the Air Force.
The Oberon class was a ship class of 27 British-designed submarines operated by five nations. They were designed as a follow-on from the Porpoise class; physical dimensions were the same but stronger materials were used in hull construction and improved equipment was fitted.
The Brazilian Navy is the naval service branch of the Brazilian Armed Forces, responsible for conducting naval operations.
USS Greenfish (SS-351) was a Balao-class submarine of the United States Navy. It was named for the greenfish.
The Type 209 is a range of diesel-electric attack submarines developed exclusively for export by Howaldtswerke-Deutsche Werft of Germany. Five class variants, including modifications thereof, have been successfully exported to 15 countries, with 68 submarines being built and commissioned to five different variants between 1971 and 2021. More boats have been built to modified designs.
The TR-1700 is a class of diesel-electric patrol submarines built by Thyssen Nordseewerke for the Argentine Navy in the 1980s, with two submarines completed. These ships are amongst the largest submarines built in Germany since World War II and are among the fastest diesel-electric submarines in the world. ARA San Juan was lost on 17 November 2017, leaving ARA Santa Cruz as the only remaining submarine of this class. As of 2020, the refit of Santa Cruz has been reported cancelled leaving the entire class inactive.
The Arsenal de Marinha do Rio de Janeiro (AMRJ) is a military organization of the Brazilian Navy. It is located in Ilha das Cobras, at the Guanabara Bay, in the city of Rio de Janeiro. The Arsenal is the main maintenance center and naval base of the Brazilian Navy, involving the design, construction and maintenance of ships and submarines, not only for the Brazilian Navy, but also friendly nations.
ARA Santa Cruz (S-41) is a member of the TR-1700 class of diesel-electric submarines of the Argentine Navy.
ARA San Juan (S-42) was a TR-1700-class diesel-electric submarine in service with the Submarine Force of the Argentine Navy from 1985 to 2017. It was built in West Germany, entering service on 19 November 1985, and underwent a mid-life update from 2008 to 2013.
MS Wildrake/Holger Dane/NSS Felinto Perry (K-11) was a motor diving vessel originally built and used by Norwegian Company. She was renamed Holger Dane after being sold to Denmark and finally NSS Felinto Perry (K-11) in the Brazilian Navy as a submarine relief ship from the Brazilian Navy. It was equipped to support diving, fire fighting and rescue of submarines.
The Foca class, or simply F, was the first naval class of submarines operated by the Brazilian Navy. It consisted of the F1, F3 and F5 submarines designed by Italian naval engineer Cesare Laurenti and built in La Spezia, Italy. The name Foca comes from the Portuguese vessel of the class. The class was part of Brazil's 1906 naval program to acquire warships to modernize its navy. The submarines were acquired to serve as a training and maintenance platform for the crews, with few naval actions during the 19 years they were active. The navy incorporated the class on 17 July 1914 and, as a result, expanded its naval structure to house these new vessels, such as the creation of the first naval school for submariners and the incorporation of ships designed to support submarines only.
The Submarine Development Program (PROSUB) is a partnership signed between Brazil and France in 2008, with the objective of transferring technology for the manufacture of military vessels. It is a component of the Brazil's Defense Strategy to develop the country's naval power with the production of four conventional submarines and the first Brazilian nuclear-powered submarine. The program will make Brazil one of the few countries to have nuclear technology, alongside the United States, Russia, France, the United Kingdom, China, and India.
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