A person is swimming underwater in a shallow, clear turquoise sea, equipped with green flippers and a snorkel. The person wears a black long-sleeved shirt and dark shorts. The seabed is visible, covered with white sand and patches of seaweed or coral. The camera angle is from below the water, looking up at the swimmer and the surface. The water is slightly rippled, and sunlight penetrates through it. The person moves forward with their legs, propelled by the flippers.