Explore the factors that make repairing leaking wells a significant challenge. Key topics include:
•    Linking leakage rates, leakage pathways and primary causes for underground leakage
•    Variability in primary cementing outcomes and impacts on leakage and repair 
•    Long term well integrity and cement, after decommissioning  
•    Repair techniques like squeeze cementing and their effectiveness on old wells
•    Strategies for reducing leakage and improving outcomes.