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The experimental Confederate submarine, H.L. Hunley again sinks in Charleston Harbor during trials, drowning eight men

C.S.S. H.L. Hunley, circa 1863, artist's impression
After a fatal training accident six weeks before, the experimental Confederate submarine H.L. Hunley, 40 feet long with a crew of eight using hand cranks for propulsion, was raised and had resumed its trials in Charleston Harbor for possible use against the Union blockade.  Disaster again struck, though, when the vessel failed to surface, drowning all aboard, including its designer, H.L. Hunley. (By John Osborne) 
Source Citation: 
Shane Mountjoy, Technology in the Civil War (New York: Infobase Publishing, 2008), 82-83.