The lead ship of Gotland class submarine that served in Svenska marinen. This diesel-electric submarine feature Air Independent Propulsion (AIP) which enchance stealth capability by increasing underwater endurance. In a simulated war game, HSwMS Gotland was notable for penetrating US Navy carrier strike group undetected and managed to "sank" the carrier.

Wikipedia

Controls

VTOL: Throttle submarine
Trim: Ballast tank control
Yaw: Rudder
Ag1-6: Arm torpedoes
Ag1-6 + hold FireWeapons: Launch torpedoes
Ag1-6 + Roll: Steer torpedo
Ag7: Extend masts

Credits

• Thanks to @PilotOfFuture for underwater propulsion.
• And to any of you tried this, like it? Upvote!
  

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Additional notes

• Important requirement. Use underwater camera mod by WNP76. Sorry mobile users but we all know the truth that mobile users only exist to suffer.
• Ocean mod might work but the mod too buggy for me. Try it yourself.
• Due to game mechanic, torpedoes will dissapear at -52ft (-15m). If you want to keep torpedoes, stay above that.
• Unlike my usual builds, this was made made totally with blueprints so this build lacking details. On the good side, the part counts pushed down really hard.
• Some of you already seen my WIP carrier. About that, it's temporarily discontinued. I'm stuck on configuring thruster that fly in group, something like this by @PlanariaLab or this by @girlsandpanzer. So i'm switching project, next post gonna be a cruiser.