Lighweight hull that can submerge itself underwater for a period of time. Great for sneak fleet attacks. This ship is refitable, can only be equiped with the new Havok Torpedoes and can fire both surfaced and submerged. While the sub is submerged it is invulnerable to ship weapons and invisible when far enough away. By carefully controlling a sub it is possible to defeate much stronger fleets. See the video below. The Predator Submarine is a good counter to any ship with weapons that have a minimum range bigger than that of the havok torpedoes. The sub disappears, by the time it reappears its within the minimum range of the ship.
NB: The Predator Submarine cannot be a fleet flagship, so you cannot make fleets consisting purely of Predator Submarines. The Predator submarine can be repaired within 5 minutes if it has no armor. When it is equiped with armor the repair time increases dramatically.