"V-2 launch noise"

The Type-XXR RaketenUnterwasserBoot was a Belkan repurposed Type XB cargo submarine to carry the V2 ballistic missile, this ship was slightly longer than the Type XB and houses a "funnel" to the middle of the ship that has the V2, the V2 is launched in a cold launch, meaning the thruster activates after the missile has been launched several meters into the air, the warhead of the missile carries a 5 kiloton nuclear warhead.

Also this submarine wasn't actually the craft that I use in that video, the one that I used was basically a modified Type VII U-Boat that looks like

So here's a better submarine

But if you want the original anyways here it is

Controls :
VTOL : Dive
Yaw : Turn
AG1 : Open funnel hatch
AG2 : Launch V2
AG3 : Reverse
AG8 : Disable submarine
Control V2 with Pitch and Yaw

Launch procedure :
Disable sub -> open hatch -> launch