When Titanic struck the iceberg on the night of April 14, 1912, the ship's electricity did not fail immediately, and this film follows the engineers below decks who kept it running as the hull filled with water. It reconstructs their shift hour by hour, from the initial collision through the final minutes, using expert interviews, ship diagrams, and dramatized detail to explain how the electric lifeboat winches and the lights that helped passengers find their way stayed powered almost to the end. None of the engine room crew survived, so the film works from technical records, wreck evidence, and survivor testimony about what they heard and saw from above to piece together what happened in spaces no passenger ever entered. It treats the engineers' decision to stay at their posts as an engineering problem as much as an act of courage, walking through the boilers, dynamos, and switchboards that had to keep functioning as the ship tilted and flooded around them.