'Carl Sagan with Gills:' A Q&A with Bob Ballard, Discoverer of The Titanic

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'Carl Sagan with Gills:' A Q&A with Bob Ballard, Discoverer of The Titanic
The Pisces IV sub, used in Bob Ballard's expedition, explores a sunken World War II Japanese submarine. The sub was sunk by the USS Ward in what is considered the first shot fired by the U.S.
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