Nuttin really special about a carrier's screws...US submarines's screws however, are a different story. Especially Boomers. Mitsubishi sold the Russkies some technology that we shared with them, so we share NO MORE! <--Add soup nazi voice.
Aussie subs (Collins class, Oberons as well) are good quiet subs, but the all time record is still held by the Ohios. The Seawolf class is *almost* as quiet. Ohio's are simply untrackable, unless they want to be tracked. Now that's not an easy thing for a guy like me to say...it was my job to track subs, but man, Ohios are friggin' holes in the water. Literally quieter than the ambient noise.
Chunk