The video shows a large octopus swimming in the ocean. The octopus is seen from different angles as it moves through the water. It has a bulbous head and eight long tentacles that undulate as it swims. The water is a clear blue color, and the sunlight filters through, creating a dappled effect on the octopus's body. The octopus's skin appears to be a mix of brown and white spots, and it moves gracefully through the water.