Sonar image was not Amelia Earhart's plane, but deep-sea explorers say search continues: "The plot thickens"

A sonar image suspected of showing the remains of the plane of Amelia Earhart, the famed American aviator who disappeared over the Pacific in 1937, has turned out to be a rock formation.

Deep Sea Vision (DSV), a South Carolina-based firm, released the blurry image in January captured by an unmanned submersible of what it said may be Earhart's plane on the seafloor.

Not so, the company said in an update on Instagram this month.