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By increasing the number of blades in the propeller and changing the shape of the blades. As a result, the bubbles produced near the propellers is reduced thereby reducing noises.What have the Russians done to make the submarines 'almost noiseless'?
Noise signature is the worst enemy of a submarine, no matter what it carries or can do.
This is a well known and old design modification.
In the Borei, they've also made a hydrodynamically efficient hull to decrease broadband noises and used a pump jet propulsion engine to further decrease noise.