Some kind of sonic pulse weapon. Sound wawes travel faster in water. If you could make a wawe of water dense enough it would destroy the enemy. But make its use chalenging, since wawes tend to bounce from seabed and rocks so you'll have to think when to use it and how to evade.
A heat mine for the lack of a better name. You drop it under the enemy and it starts boiling the water around itself. The bubles that rise to the surface decrease the bouyancy of the water and the ship just ''fals'' trough.
Red octobers catterpiller drive
ROV with sensors that goes to the surface and allows you to observe while being deep bellow.
Frigin sharks with frigin laserbeams on their frigin heads
|