One year. An estimated 1,800,000 square miles of search area. Twenty-six countries. Forty aircrafts and 43 ships. Two hundred thirty-nine people presumed dead.

The search for missing Malaysia Airlines Flight 370, which disappeared March 8, 2014, is the most expensive search effort in history. One year later, there's still no trace of the plane.

"MH370, where have you gone? ... Time flies; we are waiting and suffering," said the father of one victim.

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Hundreds of families have been left in limbo. "When you do not give us any proof, then for us there is no closure."

"It's been almost a year, and I'm living my life assuming he's going to come back," one family member told CBS.

Australia is leading ongoing deep-sea search efforts in the Indian Ocean, which includes a 23,166-square-mile search area; only 40 percent has been searched.

There are no plans past May. "By the end of May, if we still can't find the plane, then we will have to go back to the drawing board." Liow Tiong Lai told reporters.

Optimism hangs heavy. "We remain hopeful that we will solve this baffling mystery and being the peace of know what happened," said Tony Abbott.

This video includes images from Getty Images.

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Peachtree Center in downtown Atlanta is seen returning to business Wednesday morning, June 12, 2024 after a shooting on Tuesday afternoon left the suspect and three other people injured. (John Spink/AJC)

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