The Next Generation of Silent Submarines Could Defeat Radar and Sonar…

Defense systems can detect stealth submarines using two methods: sonar, which bounces sound waves off a craft, and radar, which can identify subtle disturbances on or below the ocean’s surface that can indicate a sub at depth. Now scientists are developing acoustic and fluid cloaking methods that could defeat both tactics. The acoustic cloak would use metamaterials—engineered composites designed to display certain natural properties, such as magnetism or refraction—to bend sound waves around the craft, making it undetectable to sonar

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The Next Generation of Silent Submarines Could Defeat Radar and Sonar…