Other than ... freediving is the most dangerous adventure sport in the world. - James Nestor

The doctor of speech, language pathology at Stanford... measured people who had laryngectomies... She found between 2 months and 2 years, their noses were completely blocked.

[T]hese clicks are so loud you can actually feel them in your body. Your body starts heating up after a few minutes.

I found out later that these clicks are actually used for communication. These animals also use them to see in the deep ocean. ...It's a form of called echolocation.