Hunley Schematic with Labels (image) Duke University Share Print E-Mail Caption A graphic reconstruction of the eight-man submarine H.L. Hunley as appeared just before its encounter with the Union ship Housatonic, which it sunk. The barrel on the end of the 16-foot spar contains 135 pounds of black powder. Credit Copyright 2017, Michael Crisafulli, used with permission. http://www.vernianera.com/Hunley Usage Restrictions Copyright 2017, Michael Crisafulli, used with permission. http://www.vernianera.com/Hunley Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.