The document summarizes key details about India's first indigenous nuclear-powered ballistic missile submarine, INS Arihant. It describes Arihant's origins in the 1970s, basic features like its 110m length and 6000 ton displacement. It also outlines Arihant's propulsion system, life support systems, missiles and weapons capabilities. Comparisons are made to other world-class submarines and strategic implications for regional security are discussed. The conclusion reflects on Arihant marking the start of India's submarine development journey.