The sonar image of the plane thought to belong to the famous American aviator Amelia Earhart, who disappeared in the Pacific Ocean in 1937, turned out to be a rock formation. South Carolina-based Deep Sea Vision (DSV) released blurred footage taken by an unmanned underwater vehicle in January showing Earhart’s plane lying on the seabed.

This month, the company said in an updated Instagram post that that wasn’t the case.

“After 11 months, the wait is finally over and unfortunately our target was not Amelia’s Electra 10E (it’s just a natural rock formation),” Deep Sea Vision said. “DSV continues to search as we speak,” the company added. “The plot twists and turns and there is no evidence yet that he has disappeared.”

The footage was captured by DSV during a massive search of the Pacific Ocean west of remote Howland Island, Earhart’s intended location. Earhart disappeared during a pioneering flight around the world with navigator Fred Noonan. His disappearance is one of the most fascinating mysteries in aviation history; has fascinated historians for decades and spawned countless books, films, and theories.

The popular belief is that Earhart, 39, and Noonan, 44, ran out of fuel and abandoned their twin-engine Lockheed Electra near Howland Island in the Pacific on one of the last legs of their epic journey.

Earhart, who gained fame as the first woman to fly solo across the Atlantic in 1932, set off from Oakland, California, on May 20, 1937, hoping to become the first woman to fly around the world. He and Noonan disappeared on July 2, 1937, after taking off from Lae, Papua New Guinea, on an arduous 2,500-mile (4,000-kilometer) flight to refuel at Howland Island, part of a U.S. territory between Australia and Hawaii.