A mini-submarine searching for the missing Malaysian plane has completed a full mission at its third attempt.
Two previous missions to scour the floor of the Indian Ocean for wreckage were cut short by technical problems.
The data from the sub's latest mission is being analysed. Previous forays have not shown anything significant.
It is searching in the area acoustic signals thought to be from the missing plane's "black box" flight recorders were heard.
Malaysia Airlines flight MH370 disappeared on 8 March as it flew from Kuala Lumpur to Beijing.
Using satellite data, officials have concluded that it ended its journey in seas west of the Australian city of Perth.
They do not know why the plane flew so far off course and an investigation is ongoing. Finding the plane's flight recorders are seen as key to understanding what happened.
Oil testingThe Bluefin-21, operated by the US Navy off the Australian vessel Ocean Shield, is an autonomous underwater vehicle (AUV) that can identify objects by creating a sonar map of the sea floor.
- 8 March: Malaysia Airlines Kuala Lumpur-Beijing flight carrying 239 people disappears
- Plane's transponder, which communicates with ground radar, was switched off as it left Malaysian airspace
- Satellite 'pings' indicate plane was still flying seven hours after take off
- 24 March: Based on new calculations, Malaysian PM says "beyond reasonable doubt" that plane crashed in southern Indian Ocean with no survivors
It is searching in an area defined by four acoustic signals picked up by an Australian search team, and was deployed after officials concluded that the batteries on the plane's flight recorders would likely have expired, given their one-month shelf life.
The submersible has an operating depth of 4,500m (15,000ft) and on its first mission a built-in safety device returned it to the surface after it exceeded that depth.
Its second mission was also cut short because of unspecified technical difficulties, but the third mission - a full 16 hours, plus two hours each way for diving and surfacing - went according to plan.
"Overnight Bluefin-21 AUV completed a full mission in the search area and is currently planning for its next mission," the Joint Agency Co-ordination Centre (JACC) said in a statement.
"Bluefin-21 has searched approximately 90 square kilometres to date and the data from its latest mission is being analysed."
JACC also said that an oil sample collected in the area the acoustic signals were heard had arrived in Perth for testing.
"We will provide details of the results when they become available," it said.
Officials have warned that the search for wreckage on the sea floor could take weeks or months.
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