Britain's Ministry of Defence said the Royal Navy nuclear submarine HMS Tireless has joined the search for the missing flight MH370 after arriving in the southern Indian Ocean.
Up to 10 planes and nine ships from a half dozen countries are scouring an area roughly the size of Britain, where the plane is believed to have crashed more than three weeks ago.
Search teams in the southern Indian Ocean are locked in a race against time to locate the plane's black box recorder, which has an expected battery life of around 30 days.
Retired Air Chief Marshal Angus Houston, the head of the Australian agency leading the operation, said the search is "the most complex and challenging search and rescue operation, or search and recovery operation now, that I've ever seen".
The British survey ship HMS Echo is also due to join the search effort for the flight recorder on Wednesday, as authorities in Malaysia said it is focusing its criminal investigation on the cabin crew and pilots of the missing plane.
It has cleared all 227 passengers of any involvement, the country's police chief has said.
The National police chief Khalid Abu Bakar said the passengers had been cleared of possible involvement in hijacking, sabotage or having personal or psychological problems that could have been connected to the flight's disappearance.
But Mr Bakar cautioned the investigation could "go on and on" and "at the end [...] we may not even know the real cause".
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