On February 17, 1864, the H.L. Hunley made history as the first submarine to sink a ship in battle. Soldiers on the shore waited patiently after seeing the submarine's return signal. But after several days, the ship had failed to return. What had gone wrong? In 1995, after over 130 years of searching, the H.L. Hunley was finally found buried off the coast of South Carolina. Follow author, Sally M. Walker on a fascinating journey through the workings...