This study investigates the tactical use of submarines by the United Kingdom during the Falklands War (1982), aiming to deepen the understanding of how submarines can be effectively employed in modern regional maritime conflicts. The research problem centers on the role of submarines in shaping conflict outcomes and what factors contribute to their successful tactical use. Previous research primarily highlights the deterrent effect and strategic importance of submarines but often lacks in-depth case-based analysis. This study addresses that gap by applying Wayne P. Hughes’ theory of six cornerstones of naval warfare as an analytical framework. By examining historical sources, including firsthand accounts, the analysis identifies key elements such as training, command decisions, and long-term investments in submarine capability as critical to success. The findings show that effective submarine warfare is dependent not only on technology but also on human factors and institutional readiness. The study suggests that submarine-based warfare remains highly relevant in regional conflicts due to its asymmetrical advantages and proposes further research involving firsthand interviews or comparative studies, particularly incorporating perspectives from opposing forces or modern unmanned systems in regional conflicts such as the war in Ukraine.