The search for a tourist submarine that vanished in the depths of the Atlantic Ocean is currently being conducted jointly by U.S. and Canadian rescue teams. The submarine, which was transporting five tourists to the Titanic wreck site, had a finite amount of oxygen left, which is thought to be sufficient for life for only 70–96 hours. The teams are working nonstop to locate and save the submarine and its passengers. The five people aboard the missing Titanic submarine include British-Pakistani businessman Shahzada Dawood and his son Suleman, according to a Tuesday statement from his family. According to Pakistani news outlet Dawn, the Dawood family confirmed in a statement that two members were aboard the mission and that they had lost contact. Shahzada Dawood set out on the journey with his son to witness the Titanic debris in the Atlantic Ocean. "All of us at @britishasiantst are absolutely devastated by the terrible news that our great friend and supporter Shahzada Dawood and his son Suleman are on board the missing Titanic submarine," said Richard Hawkes, CEO of British Asian Trust.