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Published 13:05 9 Jun 2019 BST
Updated 14:25 9 Jun 2019 BST

First is a character.
Emily Watson's character of Ulyana Khomyuk didn't exist at all.
Instead, Watson's character is an amalgamation of other scientists who did exist.
"There were hundreds of scientists that worked on the problem of Chernobyl. Valery Legasov was the scientist in charge, but there were so many more involved, and a lot of them were in positions of opposition to Legasov. They were at times more aggressive about the dangers, they challenged him on some of the solutions he was considering. In order to consolidate these people into one, I felt I had to create a composite character," said Mazin.
Speaking about her character, Watson said: “Craig [Mazin] describes her as a character who has been created in tribute to many of the scientists who were involved in the search for the truth and the aftermath.”It should be noted that the actions Khomyuk made in the show genuinely did happen, but in real life, those deeds were performed by a number of other people.
The second element where Mazin took dramatic licence was with the trial that occurred in the final episode.
As you may remember, the finale switches between the Chernobyl trial and the reactor 4 accident itself, both of which are told simultaneously.
In the episode, Legasov (Jared Harris) reveals exactly what happened in the power plant and in doing so, he indicts the Soviet Union's culture of cost-cutting and secrecy for causing the disaster.
"Legasov was not at the trial. This was enormous dramatic license that I took out of necessity. I could have portrayed this trial exactly as it unfolded – with other people – but we wouldn't have known who they were, and we wouldn't have cared. It also took weeks and was quite boring," said Mazin.
In real life, Legasov and Boris Shcherbina (Stellan Skarsgard) weren't at the trial at all. In HBO's Chernobyl, Dyatlov, Fomin, and Bryuhkanov are the three men on trial. However, in reality, there were three other men who were also on trial at the time: senior engineer and inspector, Yuri A. Laushkin; shift director of reactor 4, Boris V. Rogozhin, and the chief of reactor 4, Aleksandr P. Kovalenko.
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