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Heavy cruiser
A heavy cruiser is a warship armed with guns of 8-inch (203 mm) caliber, a category created by the interwar naval disarmament treaties of 1922 and 1930.
Heavy lift ship
A heavy lift ship is a specialized dry cargo ship carrying cargoes too heavy, large, or awkward for ordinary vessels, from locomotives and port equipment to drilling rigs.
Hellenistic-era warships
Hellenistic-era warships were the oared fighting galleys of the Mediterranean between 323 and 31 BC, when larger galleys replaced the classical trireme as the ship of the line.
Helmsman
A helmsman, also called a timonier, is the person who steers a boat or ship, operating a tiller, whipstaff, or ship's wheel on the orders of the officer of the watch.
Hermod (crane vessel)
Hermod was a semi-submersible crane vessel built in Japan in 1978 for Heerema Marine Contractors, with a tandem lift capacity of 8,100 tonnes; it retired in 2017 and was recycled in China.
Hiri trade
The hiri trade was the traditional Motu trade of Port Moresby, Papua New Guinea, in which sailing canoes carried clay pots to the Gulf of Papua for sago.
History of submarines
The history of submarines traces crewed underwater craft from Bushnell's Turtle in 1776 through the diesel-electric boats of the 1900s to nuclear-powered ballistic missile submarines and research submersibles like Alvin.
HMHS Britannic
HMHS Britannic was the third and last of White Star Line's Olympic-class liners, serving as a British hospital ship before sinking in the Aegean Sea in 1916.
HMM (shipping company)
HMM Co., Ltd. (에이치엠엠), formerly Hyundai Merchant Marine, is a South Korean container shipping company headquartered in Seoul. Founded in 1976, it surpassed 1 million TEU of container fleet capacity in 2025.
HMS Agincourt (1913)
HMS Agincourt, the former Ottoman battleship Sultan Osman I, was a British dreadnought carrying fourteen 12-inch guns, fought at Jutland in 1916, and was scrapped in 1924.
HMS Argus (I49)
HMS Argus was a Royal Navy aircraft carrier completed in 1918, converted from an unfinished Italian liner and considered the first true carrier with a full-length flight deck.
HMS Barham (04)
HMS Barham was a Queen Elizabeth-class fast battleship of the British Royal Navy that fought at Jutland in 1916 and was sunk by the German submarine U-331 in November 1941.
HMS Beagle
HMS Beagle was a 10-gun Royal Navy brig, launched in 1820, that made three scientific surveys, most famously the circumnavigation of 1831–1836 carrying the naturalist Charles Darwin.
HMS Birkenhead (1845)
HMS Birkenhead, launched as Vulcan, was a Royal Navy iron paddle troopship sunk off South Africa in 1852, giving rise to the "women and children first" Birkenhead Drill.
HMS Bounty
HMS Bounty, also known as HMAV Bounty, was a small British naval vessel bought in 1787 to carry breadfruit from Tahiti, famous for the 1789 mutiny led by Fletcher Christian.
HMS Challenger (1872)
HMS Challenger was a Royal Navy wooden screw corvette converted in 1872 into a floating laboratory for the first major oceanographic expedition, a three-and-a-half-year circumnavigation.
HMS Dreadnought (1875)
HMS Dreadnought, laid down as Fury in 1870, was a Royal Navy ironclad turret battleship launched in 1875 that served in the Mediterranean and was sold for scrap in 1908.
HMS Dreadnought (1906)
HMS Dreadnought was a British battleship completed at Portsmouth Dockyard in 1906, driven by Admiral John Fisher, whose all-big-gun design gave its name to a generation of battleships.
HMS Duke of York (17)
HMS Duke of York (pennant 17) was a King George V-class battleship of the British Royal Navy that crippled the German battlecruiser Scharnhorst at the Battle of North Cape in December 1943.
HMS Furious (47)
HMS Furious was a Royal Navy aircraft carrier that hosted the first landing of an aircraft on a moving ship in 1917 and was scrapped in 1948.
HMS Holland 1
HMS Holland 1 was the Royal Navy's first submarine, a Holland-type boat built by Vickers at Barrow-in-Furness and launched in 1901, now displayed at Gosport.
HMS Hood
HMS Hood was an Admiral-class battlecruiser of the Royal Navy, launched in 1918, the largest warship in the world for two decades until sunk by the Bismarck in 1941.
HMS King George V (41)
HMS King George V was a British fast battleship, lead ship of her class and flagship at the sinking of the German battleship Bismarck in May 1941.
HMS Nelson (28)
HMS Nelson (28) was a British battleship, name ship of the Nelson class, built to the 1922 Washington Naval Treaty's limits; Japanese forces in Malaya surrendered aboard her in 1945.
HMS Prince of Wales (53)
HMS Prince of Wales (pennant number 53) was a King George V-class battleship of the Royal Navy that fought the Bismarck and was sunk off Malaya in December 1941.
HMS Queen Elizabeth (1913)
HMS Queen Elizabeth was a British battleship launched in 1913, the first of any navy to mount 15-inch guns and burn oil fuel, serving as flagship in both world wars.
HMS Queen Mary
HMS Queen Mary was a British battlecruiser, a refined Lion-class ship launched in 1912, destroyed by a magazine explosion at Jutland in 1916 with 1,266 men lost.
HMS Renown (1916)
HMS Renown was a Renown-class battlecruiser of the Royal Navy, launched in 1916, armed with six 15-inch guns, capable of about 32 knots, and sold for scrapping in 1948.
HMS Repulse (1916)
HMS Repulse was a Renown-class battlecruiser of the Royal Navy, launched in 1916, that was sunk by Japanese aircraft off Malaya on 10 December 1941 with heavy loss of life.
HMS Rodney (29)
HMS Rodney was a Nelson-class battleship of the British Royal Navy, completed in 1927 with all nine 16-inch guns mounted forward, best known for helping destroy the Bismarck.