The Imperial War Museum in London holds one of the world's largest collections of military hardware, and this episode follows the conservators and curators tasked with keeping its Cold War arsenal intact. Staff work on missiles, aircraft, and weapons systems built for a war that never happened, explaining how corrosion, rare parts, and the sheer scale of some artefacts make preservation a constant battle. Interviews with the museum's specialists cover the provenance of individual pieces and the decisions behind what gets restored, what gets stabilized, and what has to be left as found. The film moves through storage facilities and workshop floors rather than just the public galleries, showing the unglamorous mechanics of keeping tanks running and missile casings from rusting through. Along the way it traces how each object connects to the wider standoff between NATO and the Warsaw Pact, using the hardware itself as a way into the era's politics and fear. The result is a practical, hands-on look at how a national collection stays alive rather than becoming static museum furniture.