As another R-class submarine, the USS R-9 was laid down in 1918 at Fore River Shipbuilding Company in Massachusetts. In 1940, after having been decommissioned for 9 years, it was placed in reduced commission and continued its activity along the coast to New London. Because it underwent decommission, asbestos insulation might have been installed on the vessel. Therefore, people who served on the USS R-9 should pay close attention to the symptoms of diseases such as lung cancer and asbestosis. The submarine was decommissioned forever in 1945 and was later sold for scrap.