On February 17, 1864, the H.L. Hunley, a 40 -foot-long Confederate submarine, sank to the bottom of the ocean off Charleston, South Carolina. The reason why is still a mystery.
That day, the Hunley became the first submarine to drop an foe ship during combat when it embedded a torpedo in the USS Housatonic’s hull. After the torpedo exploded and sank the vessel, the sub signaled to coast that its mission had been completed and started manager back to land…but it and the eight crew members aboard never returned. The sub sank to the sea floor.
After more than 150 years , nobody can say for sure what exactly happened to the men. One thing’s for sure, though — something killed them all abruptly and left no physical injuries.
After the sub was created from the ocean in 2000, the hull wasn’t found to be majorly damaged.
Even when researchers unsealed the crew compartment, they still couldn’t find a definite cause of death.
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