Natural-convection reactors can be quieter than pumped systems, yet a nuclear submarine still produces some sound. The aim is to sink that signature into the irregular acoustic background of the ocean. A perfectly silent patch is compared to pure black standing out against a dark but textured night. Regular mechanical rhythms are especially revealing because natural sound rarely repeats on the same short cycle. Effective concealment therefore means sounding like the environment, perhaps even like marine life. That resemblance does not guarantee safety in wartime: the discussion cites fish and whales being depth-charged during the Falklands War as examples of mistaken contacts.
Notable Point · 1:33:10-1:37:44
A quiet submarine must blend into the ocean
Submarine stealth depends on blending with irregular ocean noise, since perfect silence or a repeating mechanical rhythm can reveal the boat.