OCEAN CITY, Md. (AP) — A salvage company says that it has likely discovered the wreckage of a century old submarine off the coast of Maryland. The Baltimore Sun reported Thursday that the USS R-8 was a U.S. Navy sub that was used for target practice at the end of its life in the 1930s. Atlantic Wreck Salvage said that it identified the wreck using sonar as well as historical records. The sub was built in 1918 and participated in naval training off the coasts of California and the Gulf of Mexico. In 1930, the submarine became part of the Inactive Naval Reserve Fleet at Philadelphia. It was then used as a target in an aerial bombing. It sank in 1936 near Ocean City.