Tight fit: Though ahead of its time in many ways technologically, Hunley still depended on manpower to move. The crew had to crouch inside a 4-foot-high hull and rotate a long crankshaft that turned a two-blade propeller. (© Chronicle/Alamy)
Tight fit: Though ahead of its time in many ways technologically, Hunley still depended on manpower to move. The crew had to crouch inside a 4-foot-high hull and rotate a long crankshaft that turned a two-blade propeller. (© Chronicle/Alamy)