A ship that can move under water surface. The first use of submarines was military, but civilian are also used.

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German submarine force ceasefire on May 4 1945

Many sources say that a general ceasefire order was issued by Doenitz to German submarines on patrol on May 4, 1945. We know that the German instrument of surrender was signed in the early morning ...
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Underwater U-boat battles [duplicate]

In the movie U-571 (IMDB) there's a scene where two U-boats fire torpedoes at each other, at close range, while both submerged. I always imagined U-boats would fight one another while on the surface, ...
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The first use of submarines, and the appearance of “modern” submarines

The first submarines surfaced (excuse the pun) during or around the American Civil War. The question I have comes in a few parts: Did the submarines seen in the American Civil War prompt any change ...
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Did the Germans lose the U-Boat war in World war II because of a shortage of quality, rather than quantity?

In the "Battle of the Atlantic," the Germans lost almost 800 of their 1200 submarines (nearly two-thirds) sinking 3,500 Allied merchant ships and 175 warships. ...
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Did the U.S. and Soviet Union have a submarine battle in 1968?

There are books and articles about the Soviet submarine K-129 and the USS Scorpion in 1968, with various stories of attempted nuclear attacks and reprisals. Is there a factual narrative about these ...
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Are there any records that indicate a submarine vs submarine battle?

I am aware of only one which is the U-864 was sunk by the HMS Venturer but that was when both were being submerged -- according to wikipedia. Is that accurate? Which battles did happen between two ...