This video expands the model built in Part 1 and explores how priors can be added to the model. It makes use of deterministic nodes to express explicit relationships (such as pressure or temperature vs depth) and uses calibration when constitutive laws cannot be explicitly derived. Such is the case of CO2 density as a function of pressure and saturation. The graph is also expanded to model total injection capacity based on a single source, an injection period and a number of wells. It concludes with an overall simulation of the land area under which the CO2 may fill the pore space and that would hence be liable for storage.