Australia will spend 1.7 billion Australian dollars ($1.1bn) on a fleet of extra-large underwater “Ghost Shark” attack drones, in a move that officials said would supplement the country’s plans to acquire sophisticated nuclear-powered submarines.

Australian Minister for Defence Richard Marles said on Wednesday that the Ghost Shark autonomous underwater vehicles will complement Australia’s naval surface fleet and submarines to provide “a more capable and more lethal navy”.

“This is a profoundly important capability for the Royal Australian Navy,” Marles said.

“We have consistently articulated that Australia faces the most complex, in some ways, the most threatening, strategic landscape that we have had since the end of the second world war,” Marles said.

The government said it signed th

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