Submarines

WA authorities have released details of how they would respond to a potential radiation leak from a nuclear-powered AUKUS submarine.

The British defence secretary sensationally quit hours before a naval base tour with Australia’s Deputy PM.

Australia and its AUKUS allies will deploy deep-sea drones to protect key underwater cables.

Defence Minister Richard Marles says Australia will purchase only second-hand American nuclear submarines under a shake-up of the AUKUS deal.

More money and renewed political support is needed for Australia's mammoth defence project to become reality, a report warns.

An option of the United States reneging on the AUSUS deal has been put to powerful legislators.

With his comrades pushing to fire a nuclear weapon, he had a momentous decision to make.

It said OceanGate, the company that built the submersible, failed to adequately test the Titan.

The monarch's expression of support will bolster Prime Minister Anthony Albanese as he prepares to hold talks with the US President.

The announcement is seen as a signal to the US that Australia is putting its money where its mouth is on defence.