A Bluefin-21 submarine has continued to draw a blank in its search for missing Malaysian Airlines flight MH370.
The submarine is now two thirds of its way through a search of an area of the southern Indian Ocean, with no sign of the missing plane.
Malaysia Airlines flight MH370 went missing on March 9th as it flew from Kuala Lumpur to Beijing carrying 239 people.
Undertaking its ninth dive on Monday, the submarine searched a circular area with a ten kilometre radius.
The craft was joined by up to ten military aircraft and 11 ships, Australia’s Joint Agency Coordination Centre said in a statement.
The Bluefin-21, operated by the US Navy off the Australian vessel Ocean Shield, is an autonomous underwater vehicle that can identify objects by creating a sonar map of the sea floor.
It is operating at a depth of more than 4,000 metres.
Authorities warned that weather conditions in the search area were deteriorating as tropical cyclone Jack approached.