The interrogation of a spymaster. Ursula is questioned as Klaus Fuchs returns to England. Secrets threaten to be spilled and loyalties are tested. The war has ended, and the physicist could have a promising future. But will his past catch up with him? Could British intelligence services be on to him? #thebomb

S2.7 Critical mass

After Oppenheimer’s success at the Oscars, delve into the wider story of the atomic bomb. Told through the scientists and spies who changed history. Season 1 follows the scientist who discovers the destructive possibilities of harnessing nuclear power. It leads to the race to beat the Nazis to the first atomic bomb. Season 2 tells of a brilliant scientist who lives a double life, stealing atomic secrets for the Soviet Union. Season 3 is coming soon.

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Jail awaits - Klaus Fuchs is going down. But will he take Ursula with him? British intelligence wants names. As Fuchs is forced to face his past, Ursula tries to run from hers. Presenter Rosa Ellis questions how their actions have shaped today's nuclear tensions. #thebomb

S2.10 Fallout

A double life implodes. Fuchs faces judge and jury, but will he confess? A future as an eminent physicist is slipping away. And the friends who took him in as a young scientist are blindsided - they want answers. But first he must face the court. #thebomb

S2.9 Dead cat, live cat

The spy catchers close in. Klaus Fuchs is caught in the crosshairs. Spymaster Ursula has outwitted the interrogators - but can he? As he settles down in England, British intelligence services are following him at every turn. He is caught in a web of surveillance - and his faith in the Soviets is faltering. How long can he run for? #thebomb

S2.7 Critical mass

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