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  2. Watchkeeping - Wikipedia

    en.wikipedia.org/wiki/Watchkeeping

    Watchkeeping or watchstanding is the assignment of sailors to specific roles on a ship to operate it continuously. These assignments, also known at sea as watches , are constantly active as they are considered essential to the safe operation of the vessel and also allow the ship to respond to emergencies and other situations quickly.

  3. Submarines in the United States Navy - Wikipedia

    en.wikipedia.org/wiki/Submarines_in_the_United...

    Until 2014, submarine watchkeeping had an 18-hour day, as opposed to a standard 24-hour schedule. Sailors spent 6 hours on watch, 6 hours maintenance and training and 6 hours off (3 watches of 6 hours.) [24] In 2014, the Navy began transitioning the fleet to a 24-hour schedule. [25] The submarine force has always been a small fraction of the ...

  4. History of submarines - Wikipedia

    en.wikipedia.org/wiki/History_of_submarines

    A 16th-century Islamic painting depicting Alexander the Great being lowered in a glass submersible. The concept of underwater transport has roots deep in antiquity. There are images of men using hollow sticks to breathe underwater for hunting at the temples at Thebes, and the first known military use occurred during the siege of Syracuse (415–413 BC), where divers cleared obstructions ...

  5. List of submarine actions - Wikipedia

    en.wikipedia.org/wiki/List_of_submarine_actions

    1914, October 18 – German submarine U-27 sinks HMS E3 in the first ever successful attack on one submarine by another. 1914, October 20 – German submarine U-17 sinks SS Glitra in the first submarine sinking of a merchant ship during the world wars. [1] 1915, May 7 – German submarine U-20 sinks RMS Lusitania killing 1,198 and leaving 761 ...

  6. List of submarine classes of the United States Navy - Wikipedia

    en.wikipedia.org/wiki/List_of_submarine_classes...

    Prototype "fleet submarines"—submarines fast enough (21 knots (11 m/s)) to travel with battleships. Twice the size of any concurrent or past U.S. submarine. A poor tandem engine design caused the boats to be decommissioned by 1923 and scrapped in 1930.

  7. List of submarines of the United States Navy - Wikipedia

    en.wikipedia.org/wiki/List_of_submarines_of_the...

    Last conventionally powered submarine built for the US Navy. Laid after Blueback but launched and commissioned before SSN-583 Sargo: SSN-584 Seadragon: First submarine to complete a submerged circumnavigation of the Northwest Passage. SSN-585 Skipjack: Lead boat of a class of 6. First nuclear powered submarine with a teardrop hull. SSRN-586 Triton

  8. Columbia-class submarine - Wikipedia

    en.wikipedia.org/wiki/Columbia-class_submarine

    The upcoming Columbia-class (formerly known as the Ohio Replacement Submarine and SSBN-X Future Follow-on Submarine) nuclear-powered ballistic missile submarines of the United States Navy are designed to replace the Ohio class. [7] Construction of the first vessel began on 1 October 2020. [8] She is scheduled to enter service in 2031. [9] [10] [11]

  9. List of submarines of the Royal Navy - Wikipedia

    en.wikipedia.org/wiki/List_of_submarines_of_the...

    HMS Holland 1, the first submarine to serve in the Royal Navy A-class submarines, the first British-designed class. Holland class. Holland 1, launched: 2 October 1901, decommissioned: 5 November 1913