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The following units can be upgraded to Submarine:

Strategy[]

Submarines are invisible to most units. They can explore rival territory and can carry special units, but are visible (vulnerable) to enemy Destroyers and other submarines, especially Attack Submarines, which gain a +50% strength bonus against regular Submarines.

Airships also have the ability to detect Submarines, but they lose this ability when upgraded to Fighters. Because Airships can no longer be produced after Flight is discovered, it may be advisable to keep some older Airships around, in order to detect enemy Submarines.

Civilopedia entry[]

A submarine is a submersible warship, designed to attack enemy vessels while remaining hidden underwater. Although defensively weak, submarines are feared because of their ability to make a stealthy approach and attack without warning. Often, the presence of a submarine is not detected until the first of the sub's torpedoes strikes its target. The Germans first used submarine warfare extensively during World War I.

Developments after the war, such as sonar, made the submarine even more effective. During World War II, submarines were used extensively by all the world's naval powers. Today's submarines, in addition to their role as fast attack vessels, also carry nuclear weapons that can be fired from underwater positions just off the coast of an enemy country.

See also[]

Civilization IV Units [edit]
Land Anti-TankB Archer (BowmanB Skirmisher) Artillery Axeman (Dog SoldierB Phalanx VultureB) Cannon Catapult (HwachaW) Cavalry (Cossack) Chariot (Immortal War Chariot) Crossbowman (Cho-Ko-Nu) CuirassierB (Conquistador) Explorer Grenadier Gunship Horse Archer (Keshik Numidian CavalryW) Infantry Knight (Camel Archer CataphractB) Longbowman Maceman (BerserkerW Samurai) Machine Gun Marine (Navy SEAL) Mechanized Infantry Mobile ArtilleryB Mobile SAMB Modern Armor Musketman (JanissaryW Musketeer Oromo WarriorB) ParatrooperB Pikeman (LandsknechtB) Rifleman (Redcoat) SAM Infantry Scout Spearman (HolkanB ImpiW) Swordsman (Gallic WarriorW Jaguar Praetorian) Tank (Panzer) TrebuchetW War Elephant (Ballista ElephantB) Warrior (Quechua)
Naval Attack SubmarineB Battleship Caravel (CarrackB) Carrier Destroyer Frigate Galleon (East IndiamanB) Galley Ironclad Missile CruiserB PrivateerB Ship of the LineB Stealth DestroyerB Submarine Transport TriremeW
Air AirshipB Bomber Fighter Guided MissileB ICBM Jet Fighter Stealth Bomber Tactical NukeB
Civilian Corporate ExecutiveB Missionary Settler Spy Work Boat Worker (Fast Worker)
Great People Great Artist Great Engineer Great GeneralW Great Merchant Great Prophet Great Scientist Great SpyB
W Added in Warlords B Added in Beyond the Sword


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