Deep Sea Explorer is a fully functional submarine with working instrumentation that can dive down to almost any depth. The Screws really work, no hidden thrusters ore anything. You will need the ocean mod https://www.simpleplanes.com/Mods/View/1264604/Ocean by @Gestour
and the Sp-Extra mod
https://www.simpleplanes.com/Mods/View/1373209/SP-Extra by @BigBushy to make full use of the craft.
How to operate:
F5 for cockpit view (Best to switch the HUD off with F9) ,
F6 to F8 for more cameras.
AG1 to switch everything on. AG2 for the lights.
THTOTTLE: go forward.
BRAKE: go backward.
VTOL up or ROLL right to go up. VTOL down or ROLL left to go down.
YAW to turn left or right.
TRIM for trim.
PITCH for pitch.
VTOL and PITCH allow you to keep the craft at a certain depth or keep it level.
When the speed is abt 8 km/h or more, you can “fly” the submarine through the water.

The control panel:
Left upper corner: depth gauge, one marking is 10 Meters for the yellow and 100 Meters for the red needle.
Right upper corner: Compass.
Left upper switch: Main switch.
Right upper switch: Lights.
Left lower gauge: Pitch
Right lower gauge: left needle: Throttle, right needle: VTOL.
Light chain in the middle: speed, 1 light = 2 km/h
Left knob: VTOL
Right knob: TRIM
Left Stick: Throttle and Yaw
Right Stick: Pitch and Roll.

--- Enjoy exploring ---