The crew of the Confederate submarine H.L. Hunley, the first combat submarine to sink an enemy ship, may have instantly killed themselves with their own weapon, according to a new study. This finding may have solved a mystery that has endured for more than 150 years about the fate of the sub.

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The crew of the Confederate submarine H.L. Hunley, the first combat submarine to sink an enemy ship, may have instantly killed themselves with their own weapon, according to a new study. This finding may have solved a mystery that has endured for more than 150 years about the fate of the sub.