Horace Lawson Hunley

Horace Lawson Hunley (died 1863, age 40), Confederate marine engineer and inventor of the first combat submarine, Hunley, died during a trial of his vessel. During a routine test of the submarine, which had already suffered one accident, Hunley took command. After failing to resurface, Hunley and the seven other crew members drowned. The navy salvaged the submarine and put it back into use.