The ocean has a hidden acoustic layer that acts like a fiber optic cable for sound
Deep beneath the ocean surface lies a specialized acoustic waveguide that allows low-frequency sounds to travel thousands of kilometers by trapping noise within a specific density gradient.
The ocean contains a natural acoustic layer located between 200 and 1,000 meters deep that functions much like a fiber optic cable for sound. Known as a waveguide, this layer uses refraction index gradients to duct sonar signals across distances exceeding 100 kilometers.
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