Docking


 * Docking (repair) can restore you ships to full health, which cost you fuel and steel.
 * Larger ship take more time to repair, also affect by ship's current level
 * It is possible to use fast repair material (bucket) to repair a ship instantly, but still cost you resources.
 * Come with two docking slots, you can pay gold (DMM points) to buy keys in shop and expand to 4 slots
 * Repair time = HP loss X repair time X ship type + 30 seconds


 * Battle Cruiser/Fast battleship : Kongou Class


 * Aircraft Carrying Submarine : I-58 Kai (her repair time will double after remodel)


 * with assumption