Here they are about to have the most terrifying experience of their lives as divers. These active sonars, which are rarely used by ships and submarines, have a very frightening effect on people and marine life. These sonars, which emit sound waves with a noise level of 235 dB and listen to their reflection, can be heard at a distance of 500 km with a noise level of 140 dB, which is equivalent to a shot from a hunting rifle next to you. But if you are close enough, it gets even worse because the sound is so loud that it does not create a sound wave, but a shock wave, and at 200 dB it can damage your lungs, and at 210 dB it can cause hemorrhages in the brain, which can seriously injure you or even kill you. However, since active sonar is a tool that is used very rarely and carefully, there are no recorded cases of sonar deaths. But animals are not as lucky as us. Especially for whales this sound is so unpleasant that, trying to avoid it, they quickly rise to the surface and can get hit and die. #sonar #facts