I'm confused, the subway in NYC moves? Shouldn't it be more efficient if we just make the trains themselves move? Not an engineer.

Remember, these morons are still on Parler and TruthSocial. You MAGA Morons should buy a lot of strings and tin cans instead of using any other technologies.

Any noise coming out of a submarine will reveal its location. Through various detectors (hydrophones) arrayed along the hull, a sub can use triangulation to pin point another submarine, engine noise, cavitation of the propeller (Red October used an impeller interesting concept). Attack subs can also tow a long array of hydrophones to listen to subs much further away.

The US Navy maintains a series of listening devices along the east coast to listen to Soviet subs. It was named SOSUS (SOund SUrveilleance System).

There it is, SkyNet. I'm just going to lay down now and save our future overlord the trouble. Great while it lasted.

She'll need a lot more than that to pay for the incoming verdict.