According to the Australian Strategic Policy Institute, the cost of eight would be $171 billion after inflation. More recent estimates are over $200 billion.
Nobody knows what military threats to Australia from China or anyone else will exist in 2050. In these circumstances, it is folly to commit to spending over $200 billion on acquiring eight US designed nuclear attack submarines to deploy in support of the US on the China coast.
This is particularly extravagant when modern conventionally powered submarines are much cheaper and far harder to detect. Nuclear submarines are noisy because they rely on a reactor to power a steam engine with cooling pumps, turbines, reduction gears and steam in the pipes. They also expel hot water that can be detected, as can the wake on the surface when travelling at high speeds.
Modern battery powered submarines, which Australia…
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