British Royal Navy Deploys Nuclear Powered Attack Submarine Near Iran

Defence affairs - Def-Geopolitics

The British Royal Navy has deployed the Astute class nuclear powered attack submarine HMS Anson into the northern Arabian Sea, placing it within range to support strikes against Iran. The submarine departed from Perth, Australia, on March 6, 2026, and is now operating in deep waters in the Middle East. 

This follows the deployment of the Type 45 class destroyer HMS Dragon to Cyprus to counter Iranian drone attacks, and deployments of F-35B and Eurofighter combat jets to further bolster regional air defence efforts. Iran has launched retaliatory strikes against the U.S. and its strategic partners’ military facilities across the Middle East from February 28, in response to a U.S. and Israeli military assault on the country which began that day. 

The British Royal Navy’s surface and attack submarine fleets have both suffered from outstandingly poor availability rates, which has limited their ability to provide support, and resulted in only two large combat vessels being deployed to the Middle East. The international standing of Astute class submarines, however, is significantly superior to that of Type 45 class destroyers, with the latter having a long record of outstandingly poor reliability, and being among the least well armed and least versatile destroyer types in the world, which seriously limits their utility. Six Astute class attack submarines are currently in active service, with the class having had a very protracted production run. The first ship of the class HMS Astute was laid down in January 2001, and entered service almost ten years later in August 2010. The eighth and final ship, HMS Achilles, is still under construction. 

HMS Anson is the newest Astute class submarine in active service, and was commissioned in August 2022. The 7,000 ton ships each integrate up to 38 of a combination of Spearfish torpedoes and BGM-109 Tomahawk Block IV cruise missiles. This is a very limited payload compared to other submarine types, most notably the U.S. Navy Ohio class ships which integrate 154 Tomahawk missiles, equivalent to more than four Astute class ships. The ships’ limited missile carriage is particularly significant when considering that British destroyers and frigates have no cruise missile strike capabilities whatsoever. Costing approximately $2 billion each, British attack submarines use 39,000 anti-acoustic tiles to reduce their acoustic signatures, and can operate at depths of up to 390 meters.

The United Kingdom appears poised to play a more significant role in the U.S.-led war effort against Iran, although the severe limitations of its navy and ground forces have raised questions regarding the scope of the contributions the country can make. The possibility of Eurofighters being deployed from bases in Eastern Europe, possibly in Turkey, to launch Storm Shadow cruise missile attacks, alongside Tomahawk strikes by submarines, remains significant, particularly as the U.S. Armed Forces have faced increasingly critical munitions shortages. The British Royal Air Force has nevertheless seriously depleted its own cruise missile stockpiles through very large scale donations to Ukraine for use against targets in Russia, while the Navy’s stockpiles are themselves highly limited.