Down(2003)

Down is a supernatural thriller that follows Alex as he's haunted by ghostly visions of his missing friend. Desperate for answers and abandoned by those around him, Alex descends alone into the dark depths of Black Stream to uncover the truth. What he discovers in the murky waters tests his courage and sanity as he confronts the mysterious forces that linger below the surface. The film blends psychological horror with a claustrophobic atmosphere, trapping the protagonist in a nightmare where escape may be impossible.