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U-Boat Type VII B U-99

German submarine U-99 was a Type VIIB U-boat of Germany's Kriegsmarine during World War II. She was laid down on 31 March 1939 at the Friedrich Krupp Germaniawerft in Kiel as yard number 593. She was launched on 12 March 1940 under the command of Korvettenkapitän Otto Kretschmer and was assigned to the 7th U-boat Flotilla based in Kiel and later in St Nazaire.

U-99 was one of the most successful German U-boats in the war, sinking 38 ships for a total tonnage of 244,658 gross register tons (GRT) of Allied shipping in eight patrols. She damaged five more ships and took one vessel as a prize. U-99 was sunk on 17 March 1941 by British destroyer HMS Walker while attacking convoy HX 112.


1. 2x 6 Medium Cylinder Engines
2. Moving Engine Valves
3. Realistic Ballast System


1. 13x Torpedoes (93m/s max speed)
2. 8.8 cm SK C/35
3. XML AA Machinegun


1. Go to the engine room
2. Open Air, Exhaust & Fuel valves
3. Turn the key on
4. Throttle up & add clutch

Flood All of the ballast tanks
For quicker diving use emergency flooding buttons

And set the depth hold or use the dive planes


Reloading the torpedo is easier on low physics
Blow out the water out of the tube by using the blow out valve and water valve
Make sure that there is no water in the tube and open it

Press the beds button to make them fold then press the torpedo hatch button
and direct the crane to the hatch that you opened by using the left and right buttons
when its in the right place press the stop button lower the crane track
When the track connects to the torpedo press the brake button and lift the torpedo when its above the torpedo hatch close it and turn off the brake and push the torpedo into the tube when the warhead is in the tube press the button on the torpedo and close the hatch




(make sure that the emergency dive doors are closed) Open the blow out valves also the doors or valves cant be opened when the blow outs are opened then open the water valves after 30 seconds
make sure that you leave at least 100 liters of water in the ballast tanks

After blowing out the ballast tanks turn on the diesel compressor
when the engines are running and open the valve above it



1. Open the water valve and press outer hatch
2. 1500l of water needed to fire torpedo
3. Set the heading with the attack periscope or a compass put the heading into the keypad
4. Press Trigger


Enjoy the creation leave a comment and a like if you like it :)
And do not reupload

Overheating engines



Hydrophone: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3001543907&searchtext=Hydrophone

Special thanks to anonymous for making the torpedo heading microcontroller


Answers to the comments:

Throttle buttons on the tower are for desired throttle not engine or motor throttle

U boat rudders turn by pressing buttons in the control tower