The video shows a close-up of a crab swimming in the water. The crab is moving its legs and claws, and the water is clear enough to see the details of the crab's body. The crab's shell is a mix of brown and green colors, and its legs and claws are a darker shade of brown. The crab's eyes are visible, and it appears to be looking around its environment. The video does not contain any other objects or creatures, and the focus is solely on the crab.