10 years after the Malaysia Airlines disaster a shocking reason for its crash and the loss of its passengers was revealed

A retired pilot believes that the missing Malaysia Airlines flight MH370 was deliberately deviated from its course and the passengers died in the cabin, stressing that it was not possible that it crashed accidentally.

Retired Air France pilot Patrick Blilly has been working for years to try to solve the mystery of what became of the missing Malaysian plane ten years ago.

He said: “My theory is that the MH370 plane was low on pressure, and it is very easy for the pilot to depressurize the plane... All he has to do is turn the pressure valves to the manual position.”

He explained: “If the pilot actually overrides the automated system to do this, emergency oxygen masks will only allow passengers to survive for 20 minutes, which means they will quickly lose consciousness, but the equipment in the cockpit will give the pilot access to more than 20 minutes.” An hour of oxygen.

Air traffic management expert Jean-Luc Marchand worked with Patrick for four years to try to understand what happened on the flight, using a Boeing flight simulator to recreate its final moments.

They both spoke to the BBC to prepare a documentary ahead of the tenth anniversary of the loss of the flight from Kuala Lumpur on March 8, 2014.

While governments halted their official research in 2017, experts in the aviation industry continued to search for answers to what happened. The former air traffic controller and retired pilot became "convinced" that the plane had been steered by an off-course pilot for several hours before it crashed into the Indian Ocean.

The flight was heading to Beijing from Kuala Lumpur, and appeared to disappear with the loss of signals as it entered Vietnamese airspace. Using primary radar, the Malaysian Air Force indicated that the flight had made a sharp left turn and turned back.

Although pieces of the plane's wreckage were later recovered in the Indian Ocean, no trace of the 239 people on board, two-thirds of whom were Chinese, was found.