Submersible exploring the sunken Titanic goes missing

A private submersible with wealthy patrons aboard has gone missing during a dive to the Titanic’s remains. The US Coast Guard is searching hundreds of square miles as the sub has a limited amount of oxygen. The World’s Marco Werman talks with Sal Mercogliano, the host of the YouTube channel “What’s Going On with Shipping” and a maritime historian, about how the missing sub and the era of extremely expensive tourism falls into international safety agreements.

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