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Secondary hull

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Constitution class refit engineeringhull

The secondary hull of a Template:ShipClass starship.

Template:Disambiguate On many Federation starships, the secondary hull (also known as the engineering hull, the engineering section, the stardrive section, or the battle section) is a major component of the overall hull structure. The secondary hull is generally located behind and below the primary hull.

The secondary hull is usually dedicated to engineering and support functions, especially in starships built after the mid-23rd century. It is the home of the warp drive, Main Engineering, and other engineering support systems. Separating these potentially dangerous systems from the majority of the crew, located in the primary hull, allows the secondary hull to be abandoned in the event of catastrophic damage to the warp core or a loss of antimatter containment.

The warp nacelles also make a direct connection to the secondary hull. Other areas typically found in the secondary hull include the shuttlebay, cargo bays, Crew quarters, and brig. The main deflector dish is usually located at the very front of the secondary hull, as are torpedo launchers.

Galaxy class stardrive section, remastered

Stardrive section of a Template:ShipClass starship.

On Template:ShipClass starships, the secondary hull is usually referred to as the battle section because it mounts the majority of the ship's weaponry and is intended to enter combat or other dangerous situations following a saucer separation. The saucer module, containing the majority of the ship's crew (including civilians) can then retreat to safety. Both sections can operate without one another for long periods of time. Once the crisis is resolved, the two sections can reconnect. Because of this, the battle section was designed with duplicates of systems usually found only in the primary hull, including a battle bridge, sickbay, crew quarters, a computer core, and other mission-critical facilities. (TNG: "Encounter at Farpoint")

The deflector dish weapon used against the Borg by the USS Enterprise-D in 2367 required the entire forward half of the secondary hull to be evacuated due to radiation danger. (TNG: "The Best of Both Worlds")

Some Federation starship classes that lacked a secondary hull included the Miranda, NX, Akira, and Template:ShipClasses.

Several duranium alloy fragments of the IKS Toh'Kaht's secondary hull survived its destruction near Deep Space 9 in 2369. (DS9: "Dramatis Personae")

In an alternate timeline, debris from the secondary hull of the USS Voyager was found in the 29th century following a temporal explosion which obliterated the Sol system and Earth. (VOY: "Future's End")

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