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German U-Boat

A German submarine

A submarine was a specialized watercraft that could operate underwater and which was employed by most Earth navies.

Prior and during the World War II, Germany was one of the world's leading nations in the area of submarine technology. Their submarines were named "U-Boats", the term deriving from the German Navy's system of naming its submarines with U- followed by a number, where the "U" stood for Unterseeboot (literally, "undersea boat"), the German word for submarine.

Malcolm Reed's great-uncle once served on a submarine in the Royal Navy. Reed's uncle died while trying to stop on-board flooding after the submarine struck a mine. (ENT: "Minefield")

In the Julian Bashir, Secret Agent holoprogram, a submarine was waiting for the secret agent near Iceland. (DS9: "Our Man Bashir")

Submarines also existed in the mirror universe. Among them were Type VII Submarines and Project 705. (ENT: "In a Mirror, Darkly")

In TOS: "Balance of Terror", a Romulan Bird-of-Prey, equipped with a cloaking device, metaphorically represents a submarine, hiding from and combating the USS Enterprise, which represents an opposing vessel on the surface of a stretch of water. In effect, two submarine war movies, The Enemy Below and Run Silent, Run Deep, served as the basis for the episode's plot. Also, the cramped bridge of the Bird-of-Prey was deliberately evocative of a submarine, and it even included a periscope-like scope. (The Star Trek Compendium, 4th ed., p. 40)
The sets of the USS Defiant and Enterprise NX-01 were designed to be reminiscent of submarine interiors. In the former's case, one episode in particular, DS9: "Starship Down", was intentionally reminiscent of well-known submarine movies such as Das Boot.
The images from the opening credits of "In a Mirror, Darkly" were recycled footage from the 2000 Universal Studios war movie U-571; shown were German Type VII submarines, the most ubiquitous type used by the German Kriegsmarine in World War II. While the titular U-boat had a historical counterpart, the events depicted in the movie were actually loosely based on the British capture of U-110 and her Enigma coding machine and cipher keys.

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