One man said he now believes Bigfoot or Sasquatch is roaming remote areas of the United States, including an area in Missouri not that far from Kansas City.

What Scott Nelson hears in his headphones is strange, disturbing and unexplainable.

"Yes, I've heard him speak. And you will hear him speak here in a moment," Nelson said when asked if he thinks Bigfoot exists.

Nelson retired from the Navy after a 17-year career as a crypto-linguist, intercepting Russian communications and decoding them. Currently, he is a professor at Wentworth College in Missouri.

"Because of what I did in the Navy, spending years and several thousand hours speeding the human voice up and slowing it down, I could just detect language in those vocalizations," he said.

The vocalizations were captured on audiotape in the Sierra-Nevada Mountains by a group of hunters in the early 70s. Nelson came across them a few years ago while helping his son write a paper on Bigfoot.

To read more, click here.