Australian authorities deeply regret not getting missing Malaysia Airlines flight MH370 and describe the protracted secret as “unacceptable” in a ultimate report, posted Tuesday, on the unsuccessful search.

“The explanations for the decline of MH370 are unable to be proven with certainty right up until the plane is located,” the Australian Transport Basic safety Bureau (ATSB) explained in the report.

“It is just about inconceivable and undoubtedly societally unacceptable in the modern aviation era … for a substantial industrial plane to be missing and for the environment not to know with certainty what grew to become of the plane and these on board.”

The disappearance of the Boeing 777 on March 8, 2014, with 239 persons on board, on a flight to Beijing from the Malaysian funds of Kuala Lumpur, has develop into just one of the world’s best aviation mysteries.

It is thought to have been diverted countless numbers of miles off training course out over the southern Indian Ocean ahead of crashing off the coast of Western Australia.

Australia, which led the underwater hunt, and Malaysia and China named off a $160 million search for the plane in January right after getting almost nothing, despite the protests of people of these onboard.

Australia’s principal scientific company explained in August it believes with “unparalleled precision and certainty” that the plane crashed northeast of the search zone. But these findings were dismissed by Australia’s federal government at the time as not unique plenty of, and the search has not been re-opened. Performing so relies upon on getting credible, new proof about the plane’s whereabouts.

Image: ATSB Release Final Report on MH370

An MH370 mural painted on a wall in Shah Alam, Malaysia.