Submarines Features
1. Lower durability.
2. Only Submarines can dive underwater.
3. Submarines on the water surface can dive to 10m, 75m and even 150m underwater.
4. Submarines which are 75m underwater can sail fastest.
5. Submarines which are 75m underwater consumes less oxygen and won't be sensed by Destroyer's Sonar.
6. Only Submarines which are 10m underwater or above can use torpedoes.
7. A torpedo would be blocked by an island.
8. Only Submarines on the water surface can use Guns.
9. Submarines on the water surface would suffer more damage.
10. A Submarine on the water surface restores oxygen faster than the one 10m underwater.
11. Submarine's durability will be reduced when it doesn't have enough oxygen.
