|The underwater search zone is currently a 1300-square-kilometre patch of the seabed, about the size of Los Angeles.|
The sub takes six times longer to cover the same area as the ping locator, and will need about six weeks to two months to canvass the current underwater zone. The signals are also coming from 4500 metres below the surface, which is the deepest the sub can dive. The surface area being searched on Sunday for floating debris was 57,506 square kilometres of ocean extending about 2200 kilometres north-west of Perth. Up to 12 planes and 14 ships were participating in the hunt.