(AP) – The company that owned a submersible that imploded on its way to explore the wreck of the Titanic, killing all five onboard, said Thursday it has suspended operations.

Investigators believe the Titan imploded as it made its descent into deep North Atlantic waters on June 18. Among those killed was Stockton Rush, the submersible’s pilot and chief executive officer of the company, OceanGate.

The Coast Guard said last week that human remains have likely been recovered from the wreckage of the submersible and are being examined by medical officials in the U.S. Remote operated vehicles, known as ROVs, were used to retrieve the debris from the ocean floor about 12,500 feet (3,810 meters) underwater.

The U.S. Coast Guard has convened a Marine Board of Investigation, its highest level of investigation, into the implosion, and plans to hold a public hearing in the future.

The statement on OceanGate’s website says the Everett, Washington-based company “has suspended all exploration and commercial operations,” but doesn’t elaborate. Phone messages seeking comment were left with the company.

OceanGate is based in the U.S. and OceanGate Expeditions, a related company that led the Titan’s dives to the Titanic, is registered in the Bahamas.

Also killed in the implosion were two members of a prominent Pakistani family, Shahzada Dawood and his son Suleman Dawood; British adventurer Hamish Harding; and Titanic expert Paul-Henri Nargeolet. The company charged passengers $250,000 each to participate in the voyage.