Diesel boats are very quiet under water running on batteries.
There are the newer Air-independent propulsion systems making non-nuclear subs even stealthier.
“Diesel boats are very quiet under water running on batteries.”
And far superior to what they used to be. It it a common mistake to assume that after nuclear boats were developed that diesel boats simply stagnated.
“Diesel boats are very quiet under water running on batteries.”
Sound attenuation on the nuclear fleet is a top priority. For a long time our side was head and shoulders better than the Soviets in terms of running silent. Tom Clancy’s book, ‘The Hunt for Red October’ gets into this aspect of nuclear submarines.