I can't figure out what all that stuff could possibly be needed in a sub for. I certainly don't think it's needed to make it submerge, surface or go round in circles so perhaps it has another function related to some additional onboard equipment. Regardless, it all appears a bit over the top. If it were mine, I would have my heart in my mouth everytime I powered it up and would be sniffing at the air for that telltale smell of burning!
As for motors, my old 94 Passat estate was fantastic, I couldnt complain and it went like a rocket. Met its demise when I accidentally drove it through my closed gates. I was going to replace it with the later version until a garage mate of mine steered me well away with "They ain't the motor they used to be old chap, leave well alone". He was right, some owners have since complained of reliability and maintenence problems. My local garage thanked me for NOT buying one.
We had a Toyota once.. did 150,000 miles and needed nothing, not even a hose or steering gaiter and was still roadworthy when we gave it away. Now both got Honda's, utterly reliable, well built and precision driving machines. German cars have all the hype but like most German engineering, rely heavily on technology and complication and are singularly expensive to maintain and repair. These Japanese machines are truly well engineered and if our previous experience is anything to go by, we will own these two for a few years to come.