This is a video that was filmed in October of 2013, off the waters of Florida. The filmers state that they had stopped their boat to check out some of the manatees in the area, when they noticed something in the water that they couldn't identify.
You can hear from their voices that they are shocked by what they witnessed. It's an interesting piece of footage!
![](https://i.ytimg.com/vi/Cjp3gCNyGuw/maxresdefault.jpg)