Defence Nuclear Enterprise

A formidable attack submarine, HMS Agamemnon's name carries a historical lineage.

Many stories have been written about the previous Agamemnons, and this is where the next chapter begins. Find out more 👇.

One of the most advanced submarines ever built, HMS Agamemnon will play a key role in boosting security in the UK and across @NATO.

The Submarine Service has come a long way since 1901.

It not only keeps our country safe but supports jobs across the UK and showcases the best of British engineering.

Here are just some key moments from the last 125 years 👇.

📸: IWM

🎉 The first-ever National Cadets Week starts now!

We're celebrating cadets, recognising the volunteers who support them, and highlighting the positive impact Cadet Forces have in communities across the UK. #NationalCadetsWeek

From the pioneering Holland 1 to today's cutting-edge HMS Agamemnon, the Submarine Service has been at the heart of keeping the UK safe for 125 years.

Now, as the sixth Astute Class submarine arrives at HMNB Clyde for the first time, we continue that proud history.

🗓️ #OTD in 1901 the @RoyalNavy's first submarine was launched.

125 years later, Director General Submarines, Sir Chris Gardner and Director Submarine Support, RAdm Martyn Boyes discuss their time in the Submarine Service.

Watch the full conversation: ow.ly/7yvx50ZTQUj

For the first time, a @RoyalNavy uncrewed submarine has successfully launched a torpedo during a landmark trial in Scotland, showcasing a pivotal moment for AUKUS and what the UK, Australia and the US can achieve together.

Read more: royalnavy.mod.uk/news/2026/sept…

The Astute Class are the UK's current attack submarines 🇬🇧.

Conventionally armed and nuclear-powered, their stealth, endurance, autonomy and reach give the class unparalleled freedom to support worldwide operations.

Living up to the nickname 'Awesome Aggie', the sixth Astute Class submarine's capabilities include:

📍 stealthy precision strike
🌊 anti-submarine warfare
🌍 global intelligence gathering

HMS Agamemnon’s departure is a significant moment for #TeamDNE and is a clear demonstration of the engineering and industrial excellence of the Barrow workforce and wider UK supply chain.

Hear more from @ChiefDefNuclear, Maddy McTernan CB, who has been in Barrow today 👇.

HMS Agamemnon has sailed from @BAESystemsplc in Barrow and will now begin sea trials 👏.

Formidable, and highly capable, her departure showcases the best of British engineering and the dedication of tens of thousands of people across the DNE.

Read more: ow.ly/2l3U50ZRnAa

Defence Nuclear supports over 47,000 jobs.

With a salary 20% above national average, we offer a premium wage and secure employment across the UK 🇬🇧.

From roles in engineering and safety to submarine systems and emergency planning, join #TeamDNE today: civilservicejobs.service.gov.uk/csr/index.cgi?…

This week DNE colleagues from across 14 locations came together and collectively rowed 6,724km.

Building a sense of community and teamwork across defence, industry, and international partners, this kind of collaboration is key to delivering our national endeavour.

The DNE 2026 annual update to parliament has been published. Find out more: ow.ly/nul250ZOeip

Having rowed through the night, the annual DNE 24-hour row is entering its final stretch.

Founded by @ChiefDefNuclear, Maddy McTernan CB, the challenge has become a powerful demonstration of what #TeamDNE can achieve together.

Good luck for those final miles 👊.

The DNE 24-hour row has officially started 👏 🚣 .

Taking place across the UK and overseas, the row brings together #TeamDNE promoting teamwork and collaboration which is key to our One Team ethos.

On this day in 2021, AUKUS was formed.

Five years later, one of the world's most ambitious defence and technology partnerships is delivering tangible results.

Together we're turning strategic intent into industrial growth, military capabilities and stronger collective security.

Dreadnought is one of defence's most complex programmes.

When they enter service in the early 2030s, they'll maintain the UK's Continuous at Sea Deterrent (CASD) - the cornerstone of our national security 👇.

In every corner of the UK we are working to keep you safe. We manage some of defence’s most complex projects including:

🇬🇧 The UK’s nuclear deterrent and submarine build programmes
🌊 The replacement warhead programme
🔨 Infrastructure upgrades

Vanguard submarines are the ultimate guarantee of our security and that of our @NATO allies.

On patrol 24 hours a day, they are armed with the Trident 2 D5 missiles which are fitted with the UK's sovereign nuclear warhead.