U.S. Coast Guard briefing on missing Titanic tourist sub

The U.S. Coast Guard provides an update on the search for a missing 21-foot submersible which was taking passengers to view the wreck of the Titanic. The sub was launched by the Canadian research vessel Polar Prince and lost contact during Sunday's dive. It's estimated the sub, if it's still intact, will run out of oxygen on Thursday afternoon. Briefing by Rear Adm. John Mauger.

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