Titanic's Lost Sister

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An account of Dr. Robert D. Ballard's exploration of the wreck of the Britannic in September 1995. Britannic, the sister-ship of the Titanic, was sunk after a mysterious explosion while serving as a hospital ship during World War One. Ballard sets out to relocate the wreck and attempts to prove once and for all whether it was a German mine or torpedo which inflicted the fatal damage.