HOW LONG HAE WE HAD SUBMARINE ? Here is the US HL HUNLEY - a small Civil Was Submarine built in 1863. It was 40 feet (12 meters) long, built in Mobile Alabama and sank twice in 1863. It killed the crew both times. It was raised and restored both times, and in 1864 it was used to sink USS Housatonic outside of Charleston outer harbor. Hunley also sank in the battle. In 2000 it was raised, and are at Warren Lasch Conservation Center