The main goal of BRINE is to develop an early warning system for expansion of CO2 and possible upward movement of saline groundwater and additionally to develop a coupled numeric model to identify the driving forces of saltwater migration in deep geological formations. The design of the integrated early warning systems includes electromagnetic methods with natural (MT) and controlled sources (CSEM) in concert with electrical tomography (ERT) measurements along observation wells and shallow electromagnetic profiling (EM) in critical regions.