A submarine is a watercraft capable of independent operation underwater. It differs from a submersible, which has more limited underwater capability. The term is also sometimes used historically or colloquially to refer to remotely operated vehicles and robots, as well as medium-sized or smaller vessels, such as the midget submarine and the wet sub. Submarines are referred to as boats rather than ships irrespective of their size.
A corvette is a small warship. It is traditionally the smallest class of vessel considered to be a proper warship. The warship class above the corvette is that of the frigate, while the class below was historically that of the sloop-of-war.
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 Royal Canadian Navy is the naval force of Canada. The RCN is one of three environmental commands within the Canadian Armed Forces. As of 2023, the RCN operates 12 frigates, four attack submarines, 12 coastal defence vessels, eight patrol-class training vessels, two offshore patrol vessels, and several auxiliary vessels. The RCN consists of 8,400 Regular Force and 4,100 Primary Reserve sailors, supported by 3,800 civilians. Vice-Admiral Angus Topshee is the commander of the Royal Canadian Navy and chief of the Naval Staff.
The Hellenic Navy is the naval force of Greece, part of the Hellenic Armed Forces. The modern Greek navy historically hails from the naval forces of various Aegean Islands, which fought in the Greek War of Independence. During the periods of monarchy it was known as the Royal Hellenic Navy.
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 Republic of China Navy, also called the ROC Navy and colloquially the Taiwan Navy, is the maritime branch of the Republic of China Armed Forces (ROCAF).
The history of the Hellenic Navy begins with the birth of modern Greece, and due to the maritime nature of the country, this force has been the premier service of the Greek Armed Forces.
The Thetis-class gunboats was a class of five naval ships of the Hellenic Navy, originally developed for the German Navy as Class 420 and first commissioned in 1961.
The destroyer Aspis served in the Hellenic Royal Navy in 1907-1945.
The Sōryū-class submarines (16SS) are diesel-electric attack submarines. The first boat in the class entered service with the Japan Maritime Self-Defense Force in 2009. The design is an evolution of the Oyashio-class submarine, from which it can most easily be distinguished by its X-shaped stern combination diving planes and rudders. The Sōryūs have the largest displacement of any submarine used by post-war Japan.
Aetos was an Aetos-class destroyer which served in the Royal Hellenic Navy from 1912–1945.
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.
Y-1 Katsonis was a Greek submarine active during the Second World War. Katsonis, together with her sister ship, Papanikolis, formed the first class of Greek submarines ordered after the First World War. The submarine was built at the Forges et Chantiers de la Gironde shipyard, in Bordeaux, between 1925 and 1927, and commissioned into the Hellenic Navy on 8 June 1928. Her first captain was Cdr Κ. Arvanitis.
Papanikolis was one of the most successful Greek submarines during the Second World War.
Nikolaos Roussen was a Greek naval officer who distinguished himself during World War II. He served in the two most successful Greek submarines of the war as executive officer and captain. He died during the suppression of the Navy mutiny in April 1944.
The Protefs class was a group of submarines built for the Hellenic Navy in the late 1920s. The boats were built to a Loire-Simonot design in France and were larger than the preceding Katsonis class built by a different French company.
Four ships of the Hellenic Navy have borne the name Katsonis (Κατσώνης), after the 18th-century naval commander Lambros Katsonis:
Hellenic Navy 