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Jan11-07, 09:36 AM
Sci Advisor
P: 2,510
Quote Quote by Morbius View Post
I would bet that the U.S. Navy is making subs as quiet as possible within the
limits of current technology.

Dr. Gregory Greenman

Up until recently, you would have one that bet. However, the Germans appear to have beat us out with their hydrogen fuel cell powered submarine .

It is now the worlds quietest submarine, which nicely illustrates your point about the chief source of noise being something other than the propeller. The new Germans sub uses a propeller, just like nuclear powered American subs, but because it uses hydrogen fuel cells rather than a reactor, it is much quieter, because it does not have "the noise of the reactors cooling system", according to one interview I saw on, TLC.