submarine 
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SOURCE: Smithsonian
7-23-18
New Clues About Why the Confederate Submarine H.L. Hunley Sank
An emergency keel-block release suggests the crew did not panic, meaning they may have been incapacitated when the sub went down.
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SOURCE: Civil War News
10-2-14 (accessed)
Submarine H.L. Hunley’s Hull Is Slowly Becoming Visible
After soaking for three months in 55,000 gallons of sodium hydroxide to loosen the sand, sediment and rust that comprises the concretion, conservators began carefully probing the outside of the hull in early August.
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7-6-14
Do We Really Want a New Generation of Nuclear-Armed Submarines?
by Lawrence S. Wittner
Why are we building a new class of nuclear-armed subs?
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