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'Tiny sub, big ocean': Why the Titanic submersible search is so challenging

04:01
A U.S. Coast Guard vessel sits in port in Boston Harbor on Monday amidst the search for the submersible. (AFP via Getty Images)
A U.S. Coast Guard vessel sits in port in Boston Harbor on Monday amidst the search for the submersible. (AFP via Getty Images)

This article was originally published on June 20, 2023.

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