The video shows a large whale swimming in the ocean. The whale is mostly submerged, with only its tail fin visible above the water's surface. The water is a deep blue color, and the whale's skin appears to be a darker shade of blue. The whale's tail fin is large and has a distinct shape, with a pointed tip and a rounded base. The whale is moving slowly and gracefully through the water, and there are no other visible creatures or objects in the video.