Remote detection sonar threatens the oceans Report by Shark Info The sonar system consists of the receiver SURTASS (Surveillance Towed Array Sensor System), and the active LFAS (Low Frequency Active Sonar) transmitter. © Shark Info The U.S. Marines and recently NATO have been testing a sonar system which can detect submarines over long distances and which in the future is expected to cover 75% of our oceans. The technology which makes this possible is low frequency active sonar (LFAS) which works at an output sound level of more than 215 decibels. A sound pressure level of 140 decibels, for example from a gunshot, can still be measured at a distance of 380 km away. Such acoustic detonations, even if only brief, are dangerous for living organisms and pose a threat not only to whales and dolphins but also to sharks and bony fish.

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