UK leaders face an escalating simulated crisis. Murdered RAF pilots, cyber attacks and the sinking of a Russian spy ship. As Moscow turns up pressure, can they calm the storm?
After sinking Russia's sub, a deepfake drives a wedge with the US. With Russian missiles inbound, the Cabinet faces a brutal dilemma: protect military sites or the public.
As Russian missiles strike the UK and drones cripple power, the Cabinet rallies European allies. With Britain under siege, can a bold counterstrike save the country?
After the UK strikes, Russia launches a hypersonic missile. Facing a terrifying 22 minute countdown, can Gove make the ultimate choice and save the nation before time runs out?
Cathy Newman reunites the cast live to reveal bunker secrets, separate fact from fiction and ask the question gripping the nation: could it happen?
