The US Civil War-era submarine Hunley required an eight-man crew—seven to power the propeller with a hand-crank and one to steer. Within months of its launch, the Confederate sub had sunk and been salvaged twice, taking the lives of five crewmen the first time and the entire crew the second. Manned with a new crew, Hunley became the first submarine to sink a ship in battle, yet the achievement was marred when the sub itself sank, killing all aboard yet again. When was it recovered? Discuss
Source: The Free Dictionary