Initial filming started on May 13, 2018, in Fabijoniskes, a residential district in Vilnius, Lithuania, which was used to portray the Ukrainian city of Pripyat, since the district maintained an authentic Soviet atmosphere. At the end of March, production moved to Visaginas, Lithuania, to shoot both the exterior and interior of the Ignalina Nuclear Power Plant, a decommissioned nuclear power station that is sometimes referred to as "Chernobyl's sister" due to its visual resemblance and the nuclear reactor design used at both Chernobyl and Ignalina (RBMK nuclear power reactor).
People refer to each other in the form "Comrade-surname," which is inappropriate among colleagues. Dyatlov's subordinates would have called him "Dyatlov" among themselves and "Anatoly Stepanovich" (his first name and patronymic) when addressing him directly, rather than "Comrade Dyatlov." However, it is likely the writers decided against using the correct forms of address to avoid confusion with non-Russian viewers, who might think, for example, that Stepanovich is Dyatlov's surname.
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