Missing Flight MH370 Black Box 'May Never Be Found' As Underwater Search Begins

Malaysia's opposition leader has accused the Malaysian government of deliberately concealing information about the missing MH370 flight, saying the country had a sophisticated radar system that should have been able to track the plane.

Anwar Ibrahim, who has been subject to political persecution and found guilty of "sodomy' by Malaysia's current regime, said: “Unfortunately the manner in which this was handled after the first few days was clearly suspect.

A Chinese relative of passengers on the missing flight MH370 waits for the new information at a hotel in Beijing

“One fact remains. Clearly information critical to our understanding is deemed missing. I believe the government knows more than us.

“They are privy to most of these missing bits of information critical to our understanding of this mysterious disappearance of MH370.”

Captain Zaharie Ahmad Shah, who piloted the missing flight, was a known supporter of Ibrahim and his anti-corruption platform.

His comments came as Malaysia's most senior police officer has warned that the mystery of the missing MH370 flight may never be solved, and said investigations had ranged from poisoned inflight meals to cargos of exotic fruit.

Investigations into the minutiae of the cargo had come down even to a consignment of Asian tropical fruit mangosteens Inspector-General Khalid Abu Bakar said.

“We had to find out where the mangosteens came from. We tracked down who plucked the fruits, who packed them and shipped them out, who put them on the plane.

"Imagine how many people we must interview, and that was just the mangosteens.”

Malaysia's Prime Minister Najib Razak, who was visiting the headquarters of the multinational search in Perth, promised the relatives of the 239 passengers and crew that “we will not rest until there are answers”,

The underwater search for the black box of the doomed MH370 flight will begin today, with teams using towed pinger locators to hunt the Malaysia Airlines plane's data recorder. The black box's battery could die as soon as Sunday night.

Two of the ships searching for pieces of the missing plane, which has not been seen for four weeks since setting off for Beijing from Kuala Lumpur, have equipment that can search a 150 mile underwater path.

An additional 14 planes and nine ships are also forming part of the search party.

Australian Prime Minister Tony Abbott said on Friday morning that the MH370 search was "probably the most difficult search that's ever been mounted," according to the BBC.

"A large aircraft seems like something that would be easy enough to locate - but a large aircraft that all but disappeared and disappeared into inaccessible oceans is an extraordinary, extraordinary challenge that you're faced with."

Although radar data has led investigators to believe the plane crashed in the southern Indian ocean, no debris belonging to the plane has been found.

Australia's naval ship Ocean Shield is using a towed pinger locator from the US Navy. The UK's HMS Echo is also using its capabilities to search underwater.

The black box will become worthless in just a few days, when its battery stops working, but investigators hope the fair weather will aid the search. The life of the battery lasts around 30 days.

The focus is on a search area of about 84,000 sq miles, 1,000 miles north west of Perth.