The video shows an octopus on the ocean floor, moving its tentacles around. The octopus then picks up a rock and throws it at a fish that swims by. The fish quickly swims away to avoid being hit. The octopus continues to move its tentacles around, possibly searching for more food. The ocean floor is covered in rocks and coral, and the water is clear, allowing for a good view of the octopus and its surroundings.