Concealed torpedo tubes on a small attack craft.
Surface/Waterline Torpedo:
Craft is "LaunchSTorpedo". It travels at waterline, does low-moderate damage, 7m/s speed.
Torpedo:
Craft is "LaunchTorpedo". It travels 2m below waterline, does solid damage, 6 m/s speed.
Deepwater Torpedo:
Craft is "LaunchDTorpedo". It travels 4m below waterline, does heavy damage, 5 m/s speed.
Rockets:
Craft is "LaunchRocket". It travels at the level they were fired at, low damage, 8 m/s speed.
All these crafts are a line of coal blocks between two and seven in length.
All crafts fire in the direction their craft sign is oriented in.
All crafts must have an aspect ratio of no greater than 1:1 width to length in the direction of travel.