Celebrating 125 Years of ROYAL NAVY SUBMARINE SERVICE AT THE COMBINED NAVAL EVENT 2026
What is SM125?
The SM125 Anniversary celebrates 125 years of the Royal Navy Submarine Service, marking its journey from the launch of Holland 1 in 1901 to today’s advanced underwater fleet.
Spanning two World Wars, the Cold War, and modern operations, the Submarine Service has played a critical role in the defence of the United Kingdom. SM125 reflects on this proud history while also looking ahead to the future, including programmes such as SSN-AUKUS and the Dreadnought-class submarines.
Above all, SM125 honours the people behind the service, recognising the dedication and contribution of generations of submariners.
SM125 Editorial Feature
Explore the story of the Royal Navy Submarine Service in our exclusive SM125 Editorial Feature—coming soon and sponsored by Babcock.
This special publication takes you on a journey from the launch of Holland 1 in 1901, through the defining moments of the World Wars and the Cold War, to today’s cutting-edge fleet. It also looks ahead to the future of undersea defence, including programmes such as SSN-AUKUS and the Dreadnought-class submarines.
Rich in insight and storytelling, the feature highlights the innovation, operations, and people that have shaped 125 years of submarine history.
DIscover how we're celebrating at CNE 2026
Gala Dinner - Tuesday 19th May 2026
Join us for a prestigious evening of celebration at the SM125 Gala Dinner, held as part of CNE 2026.
Bringing together senior naval leaders, industry representatives, and members of the wider submarine community, the dinner honours 125 years of the Royal Navy Submarine Service. Set in a formal setting, the evening will feature speeches, entertainment, and opportunities to reflect on the Service’s proud history and future.
In partnership with the Royal Navy & Royal Marines Charity and The Submarine Family & The Royal Navy Museum, the Gala Dinner is both a celebration and a tribute to the people behind the Submarine Service—past and present.
A memorable occasion at the heart of SM125, recognising legacy, service, and innovation.
Exhibition Treasure Trail
Take part in the SM125 Exhibition Treasure Trail and explore 125 years of the Royal Navy Submarine Service in an engaging and interactive way.
Follow a series of installations positioned throughout the exhibition, each highlighting key moments in submarine history, from the launch of Holland 1 to modern-day operations. Featuring photographs, artefacts, and memorabilia, each stop reveals a unique part of the story.
Collect clues along the way to complete a hidden phrase, then submit your entry for the chance to win a prize.
Blending discovery with history, the Treasure Trail offers a fun and memorable way to experience the legacy of the Submarine Service.
Join us in celebrating
