The series relies heavily on the oral histories collected by Svetlana Alexievich. You can find Personal Narratives
To truly understand the "serie completa," one must look at the real-life documents that inspired it. Archive.org provides digital access to the primary materials that creator Craig Mazin used to build the show’s authenticity: Voices from Chernobyl: chernobyl serie completa archive.org
The acclaimed five-part HBO/Sky miniseries can be found in various formats on the Internet Archive, ranging from full episodes to production scripts: Video Content : A complete entry for the series is hosted as Chernobyl 2019 Mp 4 . Individual clips, such as the Episode 2 Meeting Scene , are also available for viewing. Production Scripts The series relies heavily on the oral histories
You're looking for information on the Chernobyl series and its availability on archive.org. Here's what I found: Individual clips, such as the Episode 2 Meeting