[SteamWake]

Originally Posted by Arclight

It's a new type of torpedo in the shape of a S-boat, designed to run on the surface. Any watchman on an enemy destroyer looking at it from a distance should spot it and think it's prey, and head over at full steam. Instead of homing in on it's target, this torpedo lures it's target to it. When the enemy tries to run down the (what they believe to be a) sub, they get a nasty surprise.