The video shows a close-up of a green sea anemone with tentacles moving in the water. The anemone is attached to a rock, and the water around it is clear. The tentacles are long and thin, and they move gently in the current. The anemone itself is a vibrant green color, and it stands out against the neutral-colored rocks in the background. The video is shot in a way that allows viewers to see the details of the anemone and its tentacles.