A prominent Pakistani businessman and his son are among five people aboard a submersible that has gone missing while exploring the wreckage of the Titanic in the North Atlantic, their family said on June 20. The 6.5-meter tourist craft, operated by OceanGate Expeditions, began its descent on June 18 but lost contact with the surface less than two hours later, according to authorities. Shahzada Dawood -- the vice-chairman of the Karachi headquartered conglomerate Engro -- and his son Suleman were aboard the vessel, which is equipped with only 96 hours of oxygen supply, a family statement said.