The primitive attack sub-H.L. Hunley was designed to help the Confederacy escape the stranglehold of Union naval blockades during the Civil War. Built privately in Mobile, Alabama, in 1863, it was fashioned from a recycled iron steam boiler and included space for eight crewmen—one to steer, and seven to turn the hand cranks that powered its propeller. Its bow bristled with a 17-foot spar mounted with a torpedo, which would detonate when rammed against an enemy ship. Early tests earned the Hunley the nickname the “peripatetic coffin”—and for good reason. It sank on two occasions during its trial runs, killing a total of 13 crewmen including its namesake, marine engineer Horace Lawson Hunley. The sub was repeatedly salvaged, however, and on February 17, 1864, Lieutenant George Dixon and a crew of volunteers sailed it into Charleston Harbor and successfully drove its torpedo into the side of the sloop-of-war USS Housatonic. The Union vessel went down in minutes, but the Hunley also sank, possibly because of damage sustained during its attack. Despite becoming the first submariners in history to destroy an enemy ship, Dixon and his Confederates all perished.