The document discusses ideas for an opening sequence for a psychological thriller set at Sawley gravel pits. It aims to instantly create a sense of mystery and tension. One idea is that the quarry is being drained and a body is discovered, with the time strain being recovering the body before it is discovered. Another is that the quarry is being filled, with the time strain being disposing of a body before it is filled. A further idea involves missing person reports and a serial killer on the loose, with detectives racing to find bodies and the killer before more people are murdered.