A recent report indicates that finality may never come for the families of the missing. Since halting its search efforts in January, the Australian government has been compiling an exhaustive report on the effort. The final document, published Tuesday, was written by the Australian Transport Safety Bureau.

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It offers a blunt conclusion: “The reasons for the loss of MH370 cannot be established with certainty until the aircraft is found.” And that is unimaginable, the report said.

“It is almost inconceivable and certainly societally unacceptable in the modern aviation era with 10 million passengers boarding commercial aircraft every day, for a large commercial aircraft to be missing and for the world not to know with certainty what became of the aircraft and those on board.”

But that appears to be what happened.

After losing radio communication with the mainland almost immediately after takeoff, Malaysia Airlines Flight 370 is generally thought to have flown on for hours, drifting thousands of miles off course before falling into the Southern Indian Ocean west of the Australian coast.

As part of the search, the three countries surveyed 710,000 square kilometers of the Indian Ocean seafloor, according to the report. High resolution sonar was used in an additional 120,000 square kilometers.

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“In all, 661 areas of interest were identified in the sonar imagery of the seafloor,” the report notes. “Of these areas, 82 with the most promise were investigated and eliminated as being related to MH370. Four shipwrecks were identified in the area.”

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Although debris from the plane eventually did wash ashore in East Africa, searchers were no closer to finding the plane.

China and Australia agreed to stop their search efforts in January after years of work. The Malaysian government will continue to investigate the disappearance.

“The ATSB expresses our deepest sympathies to the families of the passengers and crew on board MH370,” the report concludes. “We share your profound and prolonged grief, and deeply regret that we have not been able to locate the aircraft, nor those 239 souls on board that remain missing.”