Key Takeaways
Large numbers of cicadas are emerging from underground in South Carolina, creating a loud noise that has surprised residents.
The noise is caused by cicadas hatching after spending 13-17 years underground.
This year is unique as double brood cicadas are emerging at once, potentially involving trillions of cicadas.
While the noise may be bothersome, cicadas sound are harmless to humans and pets.
Cicadas Sound Causing Alarm
Authorities in South Carolina say emerging cicadas are so loud that they are being inundated with calls from residents asking about the noise.
The Newberry County Sheriff's Office on Tuesday posted a Facebook message to let the public know that "it is the sounds of nature" they are hearing.