 Welcome back to World Hearing Facts. I'm Susanna Love. You ever heard the expression, it was so quiet you could hear a pin drop? Well, as it turns out, a pin drop one meter away is only 15 dB. Today we're headed to the other end of the spectrum where I'll take you on a short journey of unlistensibly loud levels, some of the loudest sounds in the world. Our actual pain threshold for sound is around 130 dB. At 140 to 145, sound exposure is extremely damaging to our hearing, no matter how short of a time we listen to the sound. Our whole body will start to vibrate intensely, making our noses itch and our vision blurry. We'll also start to feel nauseous after a short period of time. At 163 dB, glass might break from the sound pressure alone and a human eardrum can burst. This is also the sound level inside a large airplane jet engine. At 170 dB, we start to talk more about the pressure coming from a sound wave than the actual loudness itself. This pressure becomes extremely damaging for humans, but also causes severe damage to buildings and surroundings. At 190 dB, we start to look towards earthquakes, large thunder strikes, bombs, hurricanes, or volcanic eruptions. The shock waves from the sounds above this level are fatal to humans. If you're wondering about the loudest sound ever recorded, we have to go back to the 1883 Krakatoa volcanic eruption in Indonesia, measuring in at an incredible 310 dB. For reference, it was heard almost 5,000 kilometers away, and the sound was estimated to have traveled around the earth seven times. So that's it for some of the loudest sounds you never want to hear. Thank you for listening.