> Also, I don't know anything about this USS Seawolf See https://en.wikipedia.org/wiki/USS_Seawolf https://en.wikipedia.org/wiki/USS_Seawolf , presumably we're

> Also, I don't know anything about this USS Seawolf See https://en.wikipedia.org/wiki/USS_Seawolf https://en.wikipedia.org/wiki/USS_Seawolf , presumably we're talking about the fourth (and current one). Yes, it's nuclear powered. > IIRC the problem with them is that the pumps cooling the atomic core can't be shut down, meaning there is always detectable sound. AFAIK current generation US and Russian (and presumably other navies operating nuclear subs too) nuclear subs can shut down the primary coolant pumps and rely on convection at low power. As long as they're cruising along at low speed they can be very quiet.