The search for Malaysia Airlines Flight 370, which went missing in 2014 on its journey from Kuala Lumpur to Beijing, has come to a formal close.

Ocean Infinity, a company that specializes in collecting high-resolution seabed data, announced today in a statement that its three-month search for the wreckage of the flight has ended. The search covered over 43,000 miles of ocean floor, more than four times as much as its initial goal of 10,000 miles.

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This expedition followed a two-year search by the Australian Transport Safety Bureau that did not find anything either.

Ocean Infinity is not ready to close the books completely, as its CEO Oliver Plunkett said, “We sincerely hope that we will be able to again offer our services in the search for MH370 in future.” Malaysian Prime Minister-elect Anwar Ibrahim also left open that possibility, telling The Australian, “I am not ruling out further searches in the future.”

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All 227 passengers and 12 crew from the flight have been presumed dead. The four-year search around Asia and the Indian Ocean has been the most expensive in aviation history.

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