This undated handout from the Dawood Hercules Corporation released on June 20, 2023 shows businessman Shahzada Dawood, the vice-chairman of Karachi-headquartered conglomerate Engro, and his son Suleman. Rescuers hoped on June 20, 2023 that the arrival of specialized deep-sea vessels and US Navy experts would boost desperate efforts to find the tourist submersible named Titan that went missing near the wreck of the Titanic, as oxygen for the five, including Dawood and his son Suleman, on board rapidly runs out. (Photo by Handout / DAWOOD HERCULES CORPORATION / AFP) / -----EDITORS NOTE --- RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / DAWOOD HERCULES CORPORATION" - NO MARKETING - NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS - NO ARCHIVES