Destroyers Features
1. Higher durability.
2. Cannons can attack Submarines on the water surface and 10m underwater.
3. Cannons won't be blocked by barriers and projected to hit a target.
4. 75m Bomb can attack Submarines which are 75m underwater.
5. 150m Bomb can attack Submarines which are 150m underwater.
6. Sonar can only sense the underwater situation around Submarines.
7. The range of Sonar Buoy can cover the whole map.
8. After you cast a Mine, it will be effective after 4 APs.
9. An effective Mine would cause damage on any ship it touches.
