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The search for a tour submersible that went missing during a visit to the wreckage of the Titanic has entered a third day. The United States and Canada have been using aircraft, ships and underwater equipment to search the surface and below the Atlantic in the area where the vessel was last seen. There was still no sign of the sub as of June 21, 2023, and rescuers say they will continue to work around the clock, with only two days of oxygen left on board the craft according to US Coast Guard officials.
