# Ship of the Line – Build Update Notes
This update introduces **submarine warfare**, four new historical scenarios, ten submarines from eight navies, and extensively rebuilt historical battlefields.
Major improvements have also been made to naval combat, graphics, performance, and Career Mode.
## New Historical Scenarios – Submarine Warfare
Four new submarine operations from World War I are now available:
- **Strait of Otranto (1915):** Command the Austro-Hungarian submarine U-5 and hunt the French armored cruiser *Léon Gambetta*.
- **Dardanelles (1914):** Navigate the British submarine B11 through dangerous minefields to attack the Ottoman ironclad *Mesudiye*.
- **Cape Helles (1915):** Command the German U-21 and penetrate the defenses protecting HMS *Majestic*.
- **Sea of Marmara (1915):** Take command of HMS E11 and intercept the Ottoman battleship *Barbaros Hayreddin*.
These scenarios feature newly reconstructed historical coastal terrain and underwater combat environments.
## Submarines & Underwater Combat
**Ten new submarines from eight nations:**
- Germany: U-9, U-21
- Britain: E11, B11
- Austria-Hungary: U-5
- France: Brumaire class
- Russia: Bars class
- Italy: Medusa class
- United States: L-1
- Japan: Submarine No. 6
Submarine combat now includes historically configured torpedo armaments, deck guns, diving mechanics, and underwater propulsion sounds.
Diesel engine noise transitions to quieter underwater propeller sounds when submerged.
## New Ships & Historical Fleet Improvements
- Added the French armored cruiser **Léon Gambetta (1905)**.
- Rebuilt historical fleets for the Balkan Wars and Havana scenarios, replacing substitute ships with their actual historical counterparts.
- Added and rebuilt several Age of Sail vessels, including USS *Ranger*, USS *Enterprise*, *Santa Ana*, and the Swedish frigate *Bellona*.
- Improved historical artillery and added hull plating and rivet details to steel warships.
## Rebuilt Historical Battlefields
- **Copenhagen (1801):** Reconstructed the city, coastal defenses, and surrounding waters using geographical terrain data.
- **Medway (1667):** Rebuilt Upnor Castle, coastal batteries, and the defensive chain across the river.
- **Waegyo (1598):** Improved the integration of fortress structures and surrounding terrain.
Historical battlefields now feature more detailed coastlines, terrain, fortifications, and landmarks.
## Combat, Graphics & Performance
- Improved cannon impact effects, with more realistic hull damage and penetration marks.
- Improved national colors and paint details on captured and distant ships.
- Significantly improved rendering performance in large-scale naval battles.
- Fixed aircraft carriers failing to launch aircraft in certain situations.
- Improved submarine sinking and underwater visibility behavior.
## Naval Career Mode
- **Improved World Chart:** Updated coastlines, rivers, forests, terrain, and port towns.
- **Dynamic Day & Night:** Added changing sunlight, moonlight, city lights, and ship lanterns based on the in-game clock.
- **Battle Damage Fix:** Fixed automated battle damage and casualties not being applied correctly when ships entered port during combat.
- **Save File Fix:** Fixed an issue where loading saved games could incorrectly retain current progress instead of restoring the selected save.
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Thank you for your continued support, feedback, and bug reports!
Your reports continue to help us improve historical accuracy, combat mechanics, and the overall Career Mode experience.