Massa has developed a wide variety of different underwater transducers and system that have been used in virtually every type of application, including low-frequency, high-power sonars for surveillance, mid-frequency (3 kHz - 15 kHz) sonars for surface ships, passive and active sonars for submarines, sonars for acoustic torpedos, anti-mine sonars, and underwater navigation & communication systems. Massa also has developed biomimetic autonomous vehicles and harbor defense systems. Links to a few examples of these applications are shown below: