This article offers a thorough overview of heavy-duty anchor chains used in offshore and deep-sea environments. It covers their crucial role, types, materials, manufacturing techniques, installation, and maintenance practices. Highlighting innovations like advanced alloys and smart monitoring, the article explains how anchor chains support industries such as offshore oil and gas, renewable energy, deep-sea research, and marine navigation. A detailed FAQ addresses common concerns, ensuring readers gain practical knowledge to select, maintain, and operate anchor chains safely and effectively.