Subs are sea units effective only against other sea units. Subs are unique due to their Dive command which prevents the unit from being seen by the enemy unless that enemy has a unit adjacent to the sub. While submerged Subs consume more fuel than normal (-5 instead of -1.) Subs can only be attacked by other Subs and Cruisers.

Subs are essential in naval-heavy battles. They can eliminate pesky Battleships and Aircraft Carriers with the advantage of being hidden. Subs are also useful defenders; they can create hidden blockages in waterway chokepoints allowing indirects to destroy invading forces.

Unit Classification Direct Sea Vehicle
Movement 5
Ammo 6
Vision 5
Movement Type Water
Cost 20000