The heartrending search to locate and rescue the Titan submersible before it runs out of its four-day air supply will be the focus of a new fast-turnaround documentary on U.K. broadcaster Channel 5.

Channel 5 is preparing a documentary about France’s mass rape trial, which has stunned the world and is currently in its last stretches after 11 weeks of hearings. At the center of the trial is Gisèle ...