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Titanic tourist sub goes missing sparking search
(www.bbc.com)
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The whole Ballard titanic story thing is closely related to the Thesher. He was being funded by the navy to find the thresher under the cover of searching for the titanic. Ballard convinced them to allow him to use some of the time, provided he found the thresher, to Actually look for the titanic.
https://en.m.wikipedia.org/wiki/USS_Thresher_(SSN-593)