Focusing on Titanic's safety features, and the heroic efforts of the engine room staff, who gave their lives in a bid to help evacuate the sinking vessel and summon help. Brendan Walker re-builds a Marconi wireless transmitter and Luke Perry re-creates a life jacket from the ship, while Dave Wilkes and Yewande Akinola make a flare similar to one that was launched on the fateful night. The team also explores the impact of the 1912 tragedy on the city of Southampton, which lost 549 of its citizens, who had been employed as crew. Last in the series.