This project is conducted as part of the DeepSAFE initiative, which focuses on assessing the feasibility of deep borehole disposal (DBD) for intermediate-level nuclear waste in Western Canada. Within this framework, the present project evaluates the performance of bentonite material as an engineered barrier system, specifically assessing its sealing effectiveness under deep borehole disposal conditions. The project investigates the coupled thermal (T), hydraulic (H), and mechanical (M) processes that govern bentonite behavior under representative Western Canadian geological conditions, including elevated temperatures, in-situ stress regimes, and host rock characteristics. Understanding these THM interactions is essential for predicting the long-term sealing performance, mechanical stability, and integrity of bentonite-based barriers in nuclear waste disposal systems. The outcomes of this project will support the design and evaluation of effective sealing strategies for deep borehole disposal systems.