Take it from someone who has seen the American, British and Russian submarines in action -- the American's have the quietest submarines.
The US says they do.
The Russians (former USSR) say they do.
The British say they do.
Bottom line: It all depends upon who you ask.
USA has the most nuclear submarines
The superlative form of the word quiet is quieter
The world's quietest room is located in Minneapolis, United States. It's used for research, so I'm not sure if it's open to the public.
A digital clock is the quietest.
The quietest in the group are all of them.
German submarines were referred to as U-boats during the world wars.
It was Germany.
quietest, quieter
The superlative form of "quiet" is "quietest."
Even in the Quietest Moments... was created in 1919-11.
Britain, France, Germany, Italy and USA all used submarines during WW1
The quietest trimmers are electric and don't produce much "rumble."