Every cyber security decision in a safety-critical environment is also a safety decision — but the connection is rarely obvious until something goes wrong. This collection of three interactive scenarios, developed as resources relating to the CyBOK Security-Informed Safety Topic Guide, places you at the precise moment where those two worlds collide. In a ransomware-hit hospital ward, the question of which network segment to isolate is also a question of which patients lose monitoring. In a battery storage facility, a falsified sensor reading is a cyber attack and a thermal runaway waiting to happen. In a cyber insurance claims suite, a policy clause written before anyone understood IT/OT convergence must now cover £8.2 million of consequences. Each case is drawn from realistic sector architectures and regulatory frameworks, and each requires you to navigate the trade-offs that security and safety engineers actually face — under time pressure, with incomplete information, and with real consequences for the decisions you make.