Fin Removal Milestone As Submarine's Dismantling Continues

The fin of the former HMS Swiftsure, a decommissioned nuclear submarine being dismantled by Babcock International at its Rosyth shipyard in Scotland, has been cut away and removed.

The removal of the fin (or sail in American parlance) of the boat marks a significant moment in the ongoing programme to dismantle her under the U.K. MoD's Submarine Dismantling Project (SDP). She is the first, or 'demonstrator' submarine to undergo this process via the SDP.

Led by the Babcock team, the operation to remove the fin and lower it via crane to the bottom of the dock was the first major cut in a process which should see the entire vessel dismantled by the end of 2026.

As per a recent company press statement, roughly 90% of Swiftsure’s total weight will eventually be recycled, with some of the high-quality steel repurposed into components for future Royal Navy submarines. 

Chief executive of Babcock’s nuclear sector Harry Holt commented: “Reaching this significant milestone sets a strong foundation for an enduring commitment that supports both national security and environmental responsibility and is testament to the dedication and expertise of our teams, as we look to provide a safe and secure solution to the dismantling of the UK’s decommissioned nuclear submarines.”

Submarine Delivery Agency CEO Sir Chris Gardner described the work as “ground-breaking” and added: “To see the fin of Swiftsure removed is a significant marker of progress in the Defence Nuclear Enterprise’s Submarine Dismantling Project.

“Our colleagues continue to work tirelessly alongside our industry partners in Rosyth to deliver a proven dismantling method using this demonstrator vessel.”

And the Submarine Disposals Programme’s Lorraine Russell noted: “The project showcases our commitment to sustainable disposal practices. By recycling materials wherever possible, we're ensuring these vessels that served the nation so well continue to provide value even after decommissioning.”

HMS Swiftsure was commissioned into the Royal Navy in 1973 and remained in active service until 1992. The lead boat in her class, she was about 83 metres long, displaced almost 5,00 tonnes, and was capable of reaching speeds of over 20 knots submerged.

She had a crew of 116 and was equipped with Spearfish torpedoes and Harpoon missiles. She cost about £37 million to build and was powered by a nuclear reactor, which was removed the same year as her decommissioning.

• You can read more details on the Babcock International website