Specifications are undisclosed, but the all-electric Ghost Sharks are evidently less than 12 metres long, in at least one configuration, and displace less than 100 tonnes. The six crewed submarines of Australia’s Collins class are 78 metres long and displace 3,100 tonnes. The Ghost Sharks, being numerous, should be able to simultaneously undertake such intelligence-collection in many more places than the crewed submarines can. Ghost Sharks must be much too slow to manoeuvre to make their own torpedo attacks. They can surely lay mines, however, which is presumably the strike capability that Marles said the Ghost Shark would bring.