Engineering, main engineering, or the engine room (the reactor pit in Klingonese), was the location from which the ship's main power systems were controlled. Engineering was the primary assignment of engineers and chief engineers. In the late 20th century, nuclear vessels of the United States Navy designated their engine room as the main machine room, or MMR. A ship, like the aircraft carrier USS Enterprise, had at least four main machine rooms. Each of these rooms had a nuclear fission…
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