India is strengthening naval self-reliance through indigenous production of specialized submarine rubber tiles used to enhance underwater stealth. These advanced synthetic tiles are fixed to submarine hulls and help reduce detectability by enemy sonar systems. Their purpose is twofold: absorbing incoming active sonar waves and suppressing noise generated by onboard machinery. Built as multilayer acoustic systems, the tiles contain internal cavities that trap and dissipate sound energy across multiple frequencies. This lowers sonar reflections while reducing vibrations escaping into surrounding waters. Installation requires precision bonding to the submarine hull with high-strength adhesives and sealing compounds capable of withstanding pressure, salinity, and temperature shifts. Typical tiles measure about 980 mm square, 51 mm thick, and weigh around 51 kilograms. Performance includes at least 6 dB insertion loss and 9 dB echo reduction. With a service life of up to 20 years, they offer long-term stealth benefits while reducing maintenance cycles. Mastering this technology places India among a limited group of nations capable of producing advanced anechoic coatings for submarines.
