The video shows a group of manatees swimming underwater. The water is clear and blue, and the sandy bottom is visible. The manatees are large, with grayish-brown skin and rounded bodies. They are swimming slowly and gracefully, with some of them resting on the sandy bottom. The video also includes text overlays that provide information about the behavior of manatees, such as "Do not approach resting manatees" and "Column resting" and "Bottom resting".