Extra: Race against time: the search for missing Titanic tourist sub

Disaster at 13,000 feet below sea level. A trip to see the Titanic has gone horribly wrong for the occupants of a submersible that has now lost contact. The Titan vanished with five people on board during a dive to the Titanic wreck site in the North Atlantic on Sunday. Host: Fionnán Sheahan. Guest: Senan Molony

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