Video: MH370: Underwater Search Begins
Search teams are preparing to use a mini-submarine to scan the sea bed for wreckage from flight MH370 "as soon as possible".
Air Chief Marshal Angus Houston, leading the search, told a news conference an oil slick had been found within the current search zone of the southern Indian Ocean.
Speaking at a press conference in Perth, he said: "We haven't had a single detection in six days so I guess it's time to go underwater."
Mr Houston cautioned that the use of unmanned submarine, Bluefin-21, should not raise hopes that debris from the aircraft will be found.
