An underwater camera captures a view of a murky river bottom. The lens is positioned close to the riverbed, showcasing a gravelly, sandy bottom. Two vertical wooden beams are visible, positioned close together, with green algae growing on their surfaces. The water above appears cloudy and pale green. A small school of tiny, silver fish suddenly appears and swims into view, moving around a cluster of rusty metal barrels that lie submerged on the riverbed. A dark shape with brown scales is partially visible at the very bottom of the frame, oriented toward the camera.