In a brightly lit, aquamarine swimming pool with multiple lane dividers, a person swims on the surface of the water with a snorkel. The person is predominantly submerged, but their torso and the snorkel extending above the water are visible. The person swims in a straight line, propelling themselves forward with arms and legs, with the snorkel maintaining a vertical position above the waterline. The pool water exhibits subtle ripples, reflecting the available light.