The disappearance of the H. L. Hunley is one of the greatest mysteries in maritime history. Shortly after sinking the USS Housatonic on February 17th, 1864, the Hunley vanished without a trace. For more than a century, history buffs and adventurers speculated on the legendary submarine’s fate while divers searched for the wreck in the waters off Charleston. When the Hunley was found in 1995, and then raised in 2000, many hoped the answer would finally be within grasp.

The archaeological examination of the wreck has provided tremendous insight into the pioneering submarine’s operation and offered many clues into the Hunley’s final moments. Still, a complex puzzle has emerged with evidence sometimes creating more questions than answers. We are closer to discovering the cause for the Hunley’s disappearance, but there is still no clear explanation.

Here, we have a listing of the evidence collected and some possible theories to explain why the Hunley didn’t return after her mission. Tell us what you think by VOTING HERE or emailing info@hunley.org.