Overview The HMS Anson has entered the Arabian Sea carrying Tomahawk Block IV missiles and Spearfish torpedoes . The move gives Britain a credible option to launch long‑range strikes should regional tensions, especially around the Strait of Hormuz , intensify. Key Developments Deployment announced on 21 March 2026 by the British Ministry of Defence . The submarine travelled roughly 5,500 miles from Perth, Australia, to the Arabian Sea earlier in March. Launch authority rests with the Prime Minister and is transmitted via the Permanent Joint Headquarters in Northwood. The move follows a decision by Downing Street to allow the United States to use British bases for strikes on Iranian sites threatening the Strait of Hormuz. Important Facts • HMS Anson is a nuclear‑powered attack submarine, part of the Royal Navy’s Astute class, capable of staying submerged for extended periods. • Tomahawk Block IV missiles provide a strike range of up to 1,600 km, enabling the UK to hit targets deep inside the Middle East without deploying aircraft. • Spearfish torpedoes give the submarine a potent anti‑ship and anti‑submarine capability, enhancing its survivability in contested waters. • Communication with the UK’s command structure occurs via periodic surfacing, ensuring any launch order is vetted at the highest political level. UPSC Relevance The deployment touches upon several GS topics: GS2 – Polity & International Relations: Illustrates the UK’s strategic use of its naval assets to project power and support allied operations, reflecting the concept of “strategic autonomy” in defence policy. GS3 – Economy & Energy Security: The focus on the Strait of Hormuz underscores the link between maritime security and global oil markets, a concern for India’s energy imports. GS1 – History & Geography: Understanding the historical significance of the Arabian Sea as a theatre of great‑power competition helps contextualise contemporary security dynamics. Way Forward For policymakers and aspirants, the key take‑aways are: Monitor how the UK’s naval presence influences the strategic calculus of regional actors, especially Iran and India. Assess the implications for India’s own maritime strategy in the Indian Ocean Region, including the need for credible deterrence and diplomatic engagement. Analyse the role of allied basing agreements (e.g., US‑UK) in shaping the security architecture of the Gulf and their impact on India’s foreign policy choices. Staying abreast of such deployments helps candidates answer questions on maritime security, power projection, and energy geopolitics in the UPSC mains and prelims.