The application of PVDF (Polyvinylidene fluoride) film in the active control of waterborne noise is under investigation at the Aeronautical and Maritime Research Laboratory (AMRL), Melbourne, Australia. The film is used in both sensor and actuator designs. The compliant nature of the film provides for ease of application to curved surfaces, however, its performance begins to deteriorate at temperatures above 70°C to 80°C, with a maximum operating temperature of 100°C. This may put a significant constraint on its application, particularly when used as an actuator where deleterious hot spots are easily generated in the area of electrical contacts. In this paper, we mainly present the work on an actuator for the control of noise in water-filled pipes, and briefly discuss a spatial sensor design for the control of hydroacoustic noise radiated from a rib-stiffened panel.