| Unit Information | Game Strategies | History |
 In the Extended Edition, this unit/building is affected by a damage bug.
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The Submarine is the submarine unit of the 
Industrial Age, available to upgrade from the Heavy Fireship as the successor of Fire Ships, and are built at the Shipyard.
Overview[]
When Heavy Fireships become Submarines, they gain +40 hit points, +2 movement speed and +2 line of sight, as well as a different method of attack (see below) and the ability to become invisible when not attacking and detect invisible units.
Like their predecessors, Submarines are supposed to combat Heavy Bombardment Ships and Aircraft Carriers, and they are also very effective in destroying Transport Ships. In turn, Submarines are countered with Light Ships like Destroyers and Cruisers.
Submarines are stealthed while idle or moving, but reveal themselves when attacking. They become stealthed again when not attacking for a while. Submarines can be detected by detector units or buildings, revealing their position to all enemy units. Submarines are also detectors themselves, detecting hidden enemy units, including enemy submarines and stealthed land units.
The Submarine launches two torpedoes per attack, each dealing 48 damage to the target, for a total damage of 96 damage per attack. Reloading between attacks takes 3.3 seconds. The Submarine's damage is modified depending on the target unit's stats, as can be seen in the following table:
| Unit (HP) | Damage (attacks needed) |
|---|---|
| Dreadnought (325) | 188 (2 hits) |
| Battleship (335) | 120 (3 hits) |
| Advanced Battleship (375) | 96 (4 hits) |
| Aircraft Carrier (600) | 80 (8 hits) |
| Destroyer (205) | 80 (3 hits) |
| Cruiser (210) | 68 (4 hits) |
| Submarines (250) Attack Submarine (290) |
One hit |
| Pre- Industrial Age ships
|
One hit (except Man o' War, Corvette and Sloop) |
Despite Submarines having more hit points than all types of Light Ships, they usually can't sustain much damage, as they take extra damage from most counter units. However, groups of these naval units can unleash total devastation on unaware enemy units. In other words, submarines can be used to implement an ambush or guard a specific water route.
Helicopters and Light Ships are excellent counters to Submarines, as they can spot them and deal extra damage to Submarines.
Trivia[]
- The Submarine is modeled after the Type VII U-boat.
- The Submarine's appearance in the
Industrial Age is anachronistic, as the Type VII U-boat were first used during World War II which in game corresponds to the Modern Age. - There is a low detailed model of 88mm SK C/35 naval gun mounted on the deck of the submarine, however it is purely aesthetic.
- The number "10" is written on the conning tower.
- The Submarine's appearance in the
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