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MH370 left Kuala Lumpur Airport on March 8, 2014, destined for Beijing, China with 239 people on board. However, the jet last communicated with air traffic control at 1.19am, before mysteriously vanishing over the South China Sea. Radar and satellite data showed how the aircraft suddenly changed course and flew back across Malaysia before turning south of Penang and then towards the southern Indian Ocean.
Many have suggested it proves the captain – Zaharie Shah – made a final goodbye gesture to his home town of Penang before plunging the jet into the sea.
However, leading air crash investigator Christine Negroni claimed during her book “The Crash Detectives” that Mr Shah may have not even been in the cockpit.
She believes the plane suffered a sudden depressurisation while the experienced captain was taking a bathroom break.
She wrote last year: “I find it logical to assume that Zaharie visited the business-class bathroom near the flight deck that is also used by the flight crew.
Capatain Zaharie Shah was reportedly a smoker
MH370 left Kuala Lumpur on March 8. 2014
Did he lose precious seconds struggling to remember a passcode?
“In this and all the airline’s 777’s bathrooms, a drop-down mask is there to provide oxygen in the case of depressurisation.
“Imagine what it would have been like for Zaharie to see the yellow plastic cup bob down after depressurisation.
“He would have been momentarily rattled, but with his experience, he would have realised immediately what had happened and what needed to be done.”
“He had to make a choice – try to get back to the cockpit without supplemental oxygen, or remain in the bathroom and wait for Fariq to get the plane to a lower altitude and rejoin him on the flight deck.”
Ms Negroni believes Mr Shah was then faced with a difficult task, but choose to head back to the cockpit.
She added: “I’m guessing Zaharie wasn’t confident in Fariq’s ability to handle the emergency and chose the former course of action.
Zaharie Shah has come under fire
“But the effects of oxygen deprivation would have been crippling for Zaharie, air would have been exploding from his respiratory and digestive systems.
“He would have struggled to get out of the bathroom. Perhaps he looked for a flight attendant or a portable oxygen tank.
“Perhaps he stopped to assess the situation in the cabin. Perhaps he retained focus and moved quickly to the cockpit door.”
However, Ms Negroni believes the captain may have felt heightened effects over lack of oxygen.
The route the plane is thought to have taken
Families hope to find out what happened to MH370
She continued: “The distance between the bathroom and the cockpit s just a few steps, but like Fariq, Zaharie was a smoker and probably more susceptible to the effects of oxygen deprivation.
“If he got out of the bathroom, if he got down the narrow corridor, if he got to the door of the cockpit without losing consciousness, another challenge would have awaited him.
“The cockpit door unlocks automatically when cabin altitude is lost. Would Zaharie have remembered that?
“Or did he, by force of habit, stop outside the door and enter the code?
“Did he lose precious seconds struggling to remember a passcode he did not need?”
239 people were on board the jet
Ms Negroni also detailed her entire theory on what she belives happened while Zaharie was apparently out of the cockpit.
She wrote: “My theory is that an electrical malfunction knocked out the systems on the Boeing 777 and that the plane lost pressurisation incapacitating the pilots.
“Whatever happened, it could not have caused damage serious enough to affect the airworthiness of the plane, since it flew on until running out of fuel many hours later.
“Likely, the men in the cockpit were overcome by the altitude sickness known as hypoxia, which robbed them of the ability to think clearly and land the plane safely.
“Many of the links in the bizarre chain of events that night can be explained by hypoxia, because past cases have shown how rapidly those who fall victim to it turn imbecilic.”
However, this idea is just one theory among hundreds of others proposed over the last five years.
While more outrageous ideas have claimed the plane was a “flying bomb” due to the cargo of five tonnes of mangosteens and 221kg of lithium-ion batteries.
However, we are still no closer to knowing the truth.