Increasing anthropogenic emissions of greenhouse gases, particularly CO2, have significantly contributed to climate change, which poses severe risks to humanity and the environment. Achieving the targets set by the Paris Agreement to limit global warming necessitates not only drastic emission reductions but also the implementation of effective methods to remove atmospheric CO2, namely long-term CO2 removal (CDR) technologies. In this presentation, I will introduce the cross-institutional Negative Emissions Testing Center (NET-C), recently funded by VATAT, to advance the operational readiness of existing and emerging CDR technologies. The center aims to develop infrastructure and modeling tools to assess the effectiveness and risks associated with these technologies. Specifically, I will discuss the subsurface hub project and the planned experimental setup for monitoring CO2 migration, mixing, and reaction during the long-term capture stages. This monitoring will take place in specific basalt and carbonate formations where the CO2 will be stored, at a meter scale, thus accounting for their complex chemical compositions and examining their permeability and spatial heterogeneity while reproducing the injection conditions and background flow of the brine aquifer. We believe that this setup will bridge the gap between lab-scale experimental setups and field-scale seismic monitoring, providing crucial data for the calibration of CO2 sequestration models.