In 1985, when Professor of Oceanography Robert Ballard announced he was planning a mission to find the RMS Titanic, it was actually a cover story for a classified mission to search for lost nuclear submarines.
His team finished their mission before they were due back, so they spent the extra time at sea looking for the Titanic and actually went on to actually find it!
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Historical Facts
RandomHistory is pretty interesting to know due to the mysteries it carries.