Direct Hit Prevention: Control Tower + Mast Top
Improved Gun Port: Admiral's Cabin + Munitions Chambers
Bullet-proof Armouring: Set of Repair Tools + Metal Work
Drainage Pump: Special Ship Hold + Set of Repair Tools
Command Post: Control Tower + Admiral's Cabin
Intensive Charge: Admiral's Cabin + Munitions Chambers
Heavy Bombing: Special High Explosives + Lead Shell
Special Smoke Bomb: Special High Explosives + Metal Work
Armouring Deterioration Bullet: Special High Explosives + Metal Work
Watertight Bulkhead: Anti-skid Rope + Hull Bulkhead Plating
Welcome Melee Battle: Stern Deck + Admiral's Cabin
Attack Prevention Net: Casting Net + Admiral's Cabin
Deck Barrier: Set of Repair Tools + Reinforced Iron Deck Plating