Different national fits for SSN-AUKUS

Will Britain develop a successor to Spearfish specifically around SSN-AUKUS?

An upgraded Spearfish is described as forthcoming, while Britain is expected to retain its own torpedoes and command systems within the shared programme.

The discussion treats AUKUS as pooled research and selected components that will produce related submarines with different national fits. Australia is expected to use an American combat system and weapons with a British-derived power plant, while Britain retains British command systems, weapons, and power generation. Limited American reactor-production capacity is offered as a reason for Australia's use of British power technology. Britain's specific NATO role helps explain its separate torpedo development, including Spearfish upgrades and successors. Reactor, propulsion, and potentially some sensor research can still be shared. The comparison with the F-35's different variants illustrates the argument: a common programme can produce equipment that differs substantially in service.