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Submarines had an important role in naval warfare as early as World War I.
submarine, sub, world war, torpedo, periscope, watercraft, U-boat, airlock, Enigma, weapon
Submarines submerge and surface by changing the average density of the hull.
Nuclear propulsion was first used by the US Navy for powering submarines in the mid-20th century.
The B-24 Liberator was an American heavy bomber aircraft, built in large numbers, that was used on every front during World War II.
During World War I France was part of the military alliance called 'Triple Entente'.
German sordiers in the First World War were well trained and used modern weapons.
Hovercraft are capable of travelling at high speed above the surface of water.
This animation demonstrates how sonar works.
The submarine designed by the Spanish inventor Narcís Monturiol was a pioneering work in the history of underwater navigation.
The medieval Arab inventor, Hassan Al Rammah designed the world's first operating torpedo.
Tanks developed in the mid-1910s quickly became the most important weapons of land-based military operations.
The naval battle fought by the British Navy against the German Navy was the largest sea battle in World War I.
World War I brought major changes in military technology, due to the development of new weapons.
The name of the Russian armoured cruiser became well known during the October Revolution of 1917.
HMS Dreadnought revolutionised battleship-building in the 20th century.