Naïve questions - would it be technically feasible to build modules in different countries and then assemble them into a full submarine in another?
Would it be cost effective to do so - and allow an increase in output of yards in US, UK and a new yard in Australia?
EG (gross oversimplification) - the Yanks build the reactor part, the Brits build the back and the Aussies build the front (yes I know submarines are extraordinarily complex, highly integrated pieces of equipment).
Reactor and back are then shipped to Oz to be joined to front.
I suspect I know the answer.