In this workshop I show how I investigate the fast-growing arms industry. EU defence spending has risen by 50 % since 2014 and will surge again in 2025. Using my reporting on Rheinmetall’s covert ammunition-factory deals, I walk you through linking budgets to deliveries, tracking corporate webs and staff moves, and mapping hidden trade flows. You’ll leave with hands-on OSINT tools and strategies to expose the practices that fuel the defence boom.