What wars did NATO start then? Don’t confuse countries in NATO with NATO itself.

Exactly. Making the controls yourself isn’t necessarily better, as long as the rudders and engines are engineered properly. Some seperate (emergency) control might be a good idea, in case the Bluetooth fails. Just to get the submarine back to the surface.

The submarine is a one-off experimental one that isn’t certified, hasn’t been used a lot and dives deeper than almost any other submarine. That’s enough alarm bells for me. Whatever they use to control the vessel is irrelevant to me.