typhoon is quite noisey noiser than most the hull form is not that hydrodynamic so makes a fair noise also the screws give it away too.
typhoon is over 20 years old the oldest TK208 approaching 30 russia is replacing all submarines with the newer borey class which according to america analysts could be as quiet as the ohio's
typhoon is noisey hence why it does not go out mid atlantic instead under ice where it can mask some of its noise, but still it was a good invention at the time even if it was deemed failure by russians .
24 were to be built to counter americas 24 ohios (cut to 18 after a bit and cut again now)
but only 6 made it to sea and one was broken up due to the collapse of the soviet union.
also the kirov was to be built in numbers 12 were to be built only 4 made it to sea and the fitfh becomeing extended and turned into admiral kuznetsov, one remains active 3 reserve pending
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