Known as the "Singer Secret Service Corps" and Singer's Torpedo Company", they were a group of middle age Freemasons from a wide variety of backgrounds. They developed and used inventions such as torpedo boats, underwater mines and submarines during the last two years of the war. Some of these inventions had never been seen before while others were advancements on earlier designs. One of their main weapons was patented by Edgar C. Singer, the underwater contact mine. It contained of black powder. They used up to seven different types of mines, torpedos, torpedo boats, and submarines. 