The video shows a person swimming underwater in a lake. The person is holding a fish in their hand and appears to be examining it. The water is murky, and the visibility is low, but the person and the fish are clearly visible. The person is wearing a black wetsuit and is holding the fish by its mouth. The fish is struggling, but the person is holding it firmly. The person then releases the fish back into the water, and it swims away. The video ends with the person swimming back to the surface.