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PBS News Hour
More ships join search for sub after report of banging noise
The search for the missing submersible in the North Atlantic Ocean intensified Wednesday. The day began with a surprise, reports of banging noises detected by sonar. The U.S. Coast Guard said it is still treating the mission as a search and rescue operation even as the supply of oxygen is likely dwindling for the five people aboard. Amna Nawaz reports.
