Sonar banned in the U.S
What you are hearing is a submarine’s sonar which detects submerged objects in the ocean. The US marines will no longer be able to use them until now they were used during training missions out at sea but a court has now banned them due to their harmful effects on marine animals.
Whales and Dolphins confuse these sounds with threats and they can affect their dietary behavior and even their mating habits. The Marines will have to look for another system which doesn’t disturb these animals in their own home.
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Curtesy: PlayGround +