important safety functions including isolating the waste from human contact or intrusion, providing a stable physical and chemical environment, insulating against external disturbances, and preventing or delaying the transport of radioactive materials away from the waste. Thus, a sound understanding of the geology's history and evolution is central in supporting assessments that examine the long-term performance and safety of deep disposal. This conference proceedings examines how geoscientific arguments and data are compiled and linked to create a unified description of the geological setting to support a safety case. It also examines practical aspects and limitations in collecting, linking, extrapolating and communicating such information.

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