In front of this beautiful antebellum house at the corner of Tradd Street and Rutledge Avenue lies the remains of a torpedo boat (which looked a lot like a submarine, but never fully submerged in the water), which was abandoned and left to rot in the water that used to be there. You can see a very cool photo of it here. In 1998, a team using ground penetrating radar found anomalies under the pavement of Tradd Street which resembled the boat. But since that area has long been filled in and is now under Tradd Street, it was never excavated. Pretty cool to think it is there though.