What is the logic behind Australia and other oceanic navies operating SSNs?
Short answerSSNs provide the endurance and fast transit needed to reach distant patrol areas; an SSK cannot fully reproduce those operating characteristics.
NotesNuclear boats devote more space to stores and reach distant patrol areas faster, preserving food and time on station. The cancelled French-Australian conventional program is used to illustrate the mismatch between an SSK hull and SSN-like range expectations. Industrial promises and workforce capability also deteriorated, but the core demand remained a boat able to operate thousands of miles from Australia.