With the caveat that it's been a minute since I was there, at low speed there was absolutely nothing. I looked up and saw we were moving; until that moment, I didn't even realize we were underway.

I vaguely recall some noise and vibration at speed, but it was relatively quite quiet.

Most ships use electric motors since decades.

They use diesel to run a generator. It's more efficient.

So the vibration of the motors is going to be the same as a normal fossil fuel ship.