Fiber optic acoustic systems are placed underwater to detect sounds from sources such as ships, submarines, and seismic activity. Currently, Northrop Grumman is developing more durable and longer lasting acoustic systems that will better withstand the harsh environment of the ocean. In order to provide their customers with effective acoustic systems with a longer service life, material selection is important in their design. The Clinic team will research, test, and report on the environmental compatibility and mechanical properties of materials used for acoustic arrays. The team will also provide clear procedures for future material testing.