HMS Astute has returned to sea, marking the end of a 100-day period with no British attack submarines at sea, since HMS Triumph, the last such submarine, was operational.

Following its own 307-day maintenance and upgrade period, HMS Astute’s return signifies a crucial step in restoring the Royal Navy’s submarine operational capacity.

As HMS Astute begins to reenter service, it is likely undertaking a series of trials and necessary tasks to bring the crew and vessel up to full operational standards. This phase is critical for ensuring that both the submarine and its crew are adequately prepared for their duties after a significant period of downtime.

This period of inactivity highlights the Royal Navy’s challenges in maintaining its submarine fleet’s operational readiness due to a maintenance backlog. HMS Anson, another Astute-class submarine, completed its post-trials operations on April 20th and was the last of the Astute-class to be at sea prior to HMS Astute’s return.

Please note, readers, that the Vanguard fleet, carrying the Continuous At Sea Deterrent, continues to meet its obligations. The Astute-class submarines are particularly vital for intelligence operations and maintaining a strategic underwater presence.

According to the data, the inactivity is largely due to ongoing maintenance and refitting operations. Efforts are underway to resolve this through projects for new floating dry docks aimed at addressing the maintenance bottleneck.

A Royal Navy spokesperson added, “To maintain operational security, we do not comment on the details of submarine operations. The Royal Navy has delivered the UK’s continuous at sea deterrent without fail for the last 55 years. British waters are always fully protected with a range of assets including warships, patrol aircraft, and submarines.”

If you’re reading this story and thinking about reporting this story based on the information in ours, please include a link back.

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George has a degree in Cyber Security from Glasgow Caledonian University and has a keen interest in naval and cyber security matters and has appeared on national radio and television to discuss current events. George is on Twitter at @geoallison
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Andy reeves
Andy reeves (@guest_860724)
16 hours ago

what an appalling statistics this makes mine, and doubt everybody else’s blood boil.

Mark B
Mark B (@guest_860737)
15 hours ago
Reply to  Andy reeves

To be fair Anson could have, and probably still can, put to sea at any point. Also I suspect that there is not much wrong with many of the other Astutes. If push comes to shove I suspect many of them would put to sea and manage to fullfil thie primary role.

It would be good to see the dry dock back in working order and reducing the backlog of repairs – it’s annoying but my blood is not boiling just yet.

Jim
Jim (@guest_860742)
15 hours ago
Reply to  Mark B

I agree, it’s unlikely there is anything wrong with most of the boats, better having them in dock and near home with Russia kicking off and lack of maintenance facilities. The US has identical issues at the moment.

Spyinthesky
Spyinthesky (@guest_860751)
13 hours ago
Reply to  Jim

Mind you as many claim it’s their exclusive job to actually sink surface ships rather than our own surface ships then it is rather important as many as possible actually are at sea, or at least ready to.

Daniele Mandelli
Daniele Mandelli (@guest_860832)
22 minutes ago
Reply to  Spyinthesky

To my mind their main job is ASW. If we need to do sea denial with them then the capability is there.

Geoff Roach
Geoff Roach (@guest_860762)
12 hours ago
Reply to  Jim

You are joking?

Nick
Nick (@guest_860769)
9 hours ago
Reply to  Jim

This was my thought, too. If Russia kicks off a surprise Northern Fleet operation of some kind, better to have the bulk of the submarines available to start new patrols.

Robert Blay
Robert Blay (@guest_860797)
5 hours ago
Reply to  Nick

Russia doesn’t have anything like the resources for such an operation.

Supportive Bloke
Supportive Bloke (@guest_860813)
2 hours ago
Reply to  Robert Blay

Doesn’t stop it playing submarine games.

Subs are the Russian’s best assets.

Sceptical Richard
Sceptical Richard (@guest_860829)
54 minutes ago
Reply to  Mark B

If they had the crews for them. Ironically I suspect the burden of keeping CASD going without interruption has severely impacted the rest of the branch

Robert Blay
Robert Blay (@guest_860744)
15 hours ago
Reply to  Andy reeves

Ita good news Astute is back at sea.

Daniele Mandelli
Daniele Mandelli (@guest_860833)
21 minutes ago
Reply to  Robert Blay

It is. And still some can only ever see the negative, even with this single boat.
It’s a positive step and things will improve.

Exroyal.
Exroyal. (@guest_860806)
3 hours ago
Reply to  Andy reeves

Could not agree more. Looks like the garage commitment has been parked up along with the fleet. So SF is probably relying solely on US for training. That’s all well and good for SF, however our boat crews are not keeping their launch and recovery skills current.

Daniele Mandelli
Daniele Mandelli (@guest_860834)
18 minutes ago
Reply to  Exroyal.

It’s not great on that front, no.
As there are other insertion methods i assume its low on their priority list?

Order of the Ditch
Order of the Ditch (@guest_860735)
16 hours ago

Hopefully a corner has been turned and submarine availability will continue to improve.

ChariotRider
ChariotRider (@guest_860748)
14 hours ago

I’ll second that!

Cheers CR

Tom
Tom (@guest_860740)
15 hours ago

So one attack boat is back at sea. 😠

ABCRodney
ABCRodney (@guest_860741)
15 hours ago

Unlike some who will deplore the situation we are. I’m just going to say welcome back Astute and our political masters for 30 years of inept, incompetent dithering that led and her Sister boats without the proper facilities to keep you maintained. However I would also point out that perhaps the RN Admirals should have paid more attention to infrastructure than just political games with the other services together more ships things might have been better. I’ve looked at the timelines and irony of irony the uplift in infrastructure investment started off in TM’s period in office and we had… Read more »

Jim
Jim (@guest_860752)
13 hours ago
Reply to  ABCRodney

Makes a lot of sense to buy up Inchgreen especially if we plan to greatly expand the SSN fleet and have the possibility for supporting more USN vessels.

Naval Drydocks that can handle SSN seem to cost billions to build now a days and an opportunity to buy up such a facility should not be overlooked.

Robert Blay
Robert Blay (@guest_860801)
4 hours ago
Reply to  Jim

Be careful with thoughts of a big expansion. Until something is officially announced or the requirement for a certain number of boats has been made official. I’d assume the number of SSN A will be 7. Hopefully it will be 8-10. But until it’s official. I wouldn’t get your hopes up to much.

Daniele Mandelli
Daniele Mandelli (@guest_860816)
2 hours ago
Reply to  Robert Blay

Exactly. The new minimum is always the new benchmark.
Which is why I wonder if parts of AUKUS are worth it when we end up with 7, no real increase, and yet more assets lost elsewhere in cuts to fund, primarily, industry. Again.
I’m waiting for it.
It’ll be the same with Tempest, if Starmer can stand it.

ABCRodney
ABCRodney (@guest_860836)
1 minute ago

Daniele, I doubt that anyone can accurately say with any degree of certainty what the future size of the RN Submarine fleet will be. In many ways the linear way of thinking about capability vs budget has just gone straight out the nearest window. Our experience of the last 30 years has been Capability goes up, so costs go up, which means we can afford fewer which in turn forces costs up again and so on in perpetuity. My best guesstimate is we will not have any real answers for a couple of years and that will all depend on… Read more »

Daniele Mandelli
Daniele Mandelli (@guest_860753)
13 hours ago
Reply to  ABCRodney

It seems such a no brainer mate?

Supportive Bloke
Supportive Bloke (@guest_860760)
13 hours ago

Inch green can’t take QEC the cill is too high.

As for nuclear – no chance. It isn’t certified. It is massive, which is actually an issue – you don’t want a massive dock for nuclear you want a snug fit. It has no segregated sump system – so no way of storing contaminated water is something went wrong. The dock probably isn’t watertight either way. There are no facilities and no workforce. Does it even still have pumps? I’ve no idea!!

Jonno
Jonno (@guest_860770)
9 hours ago

Never say never, you have to start somewhere and be a Cando nation again. I think its probably an excellent idea.

FormerUSAF
FormerUSAF (@guest_860773)
7 hours ago

Possibility of grant of nuclear surety waiver(s)? Probably not politically feasible during peacetime, but could become feasible upon commencement of hostilities. 🤔

Supportive Bloke
Supportive Bloke (@guest_860815)
2 hours ago
Reply to  FormerUSAF

The days of the Crown doing that kind of thing have faded.

There was a time when all that had to be said was MoD / Official Secrets Act / Defence of the Realm and that overrode everything else.

Not these days. Now that MoD falls under the useless Health and Safety regimes.*

I love Health and Safety but not UK style.

ABCRodney
ABCRodney (@guest_860838)
5 seconds ago

The days are over for the Crown doing that sort of thing ? Maybe we are more subtle about it but we seem to have Nationalised SFM without a whisper.

Daniele Mandelli
Daniele Mandelli (@guest_860819)
2 hours ago

I have no idea either. And I had no idea on any of that detail. It must have some use as a national strategic asset?

ABCRodney
ABCRodney (@guest_860837)
1 minute ago

I know the pumps are still there, it is watertight but that’s about it. All facilities were removed by present owners. As far as I’m aware no Drydock in UK we’re built Nuclear Certified all have had to be converted for use.
As for the Cill height yes it’s higher than Rosyth but so is the tidal variance in the Clyde.
Spookily one of its last uses was building the floating jetty for Faslane.

Quentin D63
Quentin D63 (@guest_860756)
13 hours ago
Reply to  ABCRodney

Good one. And if the MOD ever reads all the contributors to the SDR and not just who’ve they’ve appointed they might find some gem comments from the UKDJ and take yours and others suggestions up.

Last edited 13 hours ago by Quentin D63
Gfor
Gfor (@guest_860820)
1 hour ago
Reply to  ABCRodney

It would take more investment to upgrade it rather than building from scratch unfortunately.
Rules that have to be followed, including earthquake proofing the structure for those frequent events we apparently have rented the upgrades highly impractical and cost prohibitive.
Our government has implemented these outlandish rules in the guise of the nuclear regulator, whereas China, North Korea and Russia seem to be less risk averse.
In addition, I wouldn’t have another facility in the Clyde area, eggs in one basket and all that. Falmouth would be a better 3rd submarine facility, good shelter and access to the western approaches.

Ron
Ron (@guest_860746)
15 hours ago

I still have one concern the dry docks. Will they or are they designed capable to take the future SSN-AUKUS. My understanding is that the future SSN-As will be a much bigger boat.

ABCRodney
ABCRodney (@guest_860759)
13 hours ago
Reply to  Ron

Well if you are referring to the Floating docks they are to be capable of handling a Dreadnought and an SSN(A) isn’t going to be that big. If you mean Inchgreen it was built to be able to handle a US CVN, so yep plenty big enough. Floating docks have their advantages in that they can be moved, but quite where we can build them in the UK could be an issue. To me it makes more sense to re acquire assets that we the Tax payers funded in the 1st place and are capable of far more than sitting… Read more »

FormerUSAF
FormerUSAF (@guest_860774)
7 hours ago
Reply to  ABCRodney

Never realized before that Inchgreen was designed to be able to accommodate a USN CVN. Some bloke down at the Admiralty must have been guilty of indulging in forward planning. 🤔😳😉

Supportive Bloke
Supportive Bloke (@guest_860818)
2 hours ago
Reply to  FormerUSAF

But it was never nuclear licensed so the forward planning failed at that point!

It was really developed to try and get the UK into constructing super tankers in an era when Shell and BP were national champions and big spenders and before they were fully privatised.

Needless to say that never worked.

Jonathan
Jonathan (@guest_860827)
1 hour ago
Reply to  Ron

Yes dock 10 is huge as in capital ship sized.

so Devonport will have

dock 9 SSBN sized dedicated for SSBNs
Dock 10 SSBN sized ( beyond any potential nuclear sub size) for both SSN and SSBN refit
Dock 15 specific Asute dock.

Jonathan
Jonathan (@guest_860755)
13 hours ago

Remember as well the RN will be be getting a new SSN commissioned in 2025 and then another in 2026. So even with the maintenance backlog the RN will have a lot of more give to sort out the issues with the 2 new SSNs.

Geoff Roach
Geoff Roach (@guest_860761)
12 hours ago

A whole submarine. Wow. It’ll probably be back in a week when the crew fall out with each other.😷

Bazza
Bazza (@guest_860765)
12 hours ago

I want to know how we managed to have 2/4 docks under maintenance at once. That seems like it was always going to go wrong.

Frank62
Frank62 (@guest_860776)
5 hours ago

Maybe the point for those who think surface threats can be dealt with by our subs, allowing a tiny escort force, is that with such a tinier sub fleet that’s just wishful thinking. 7 subs means even 3 operational is pretty good & usually less probable. 0 available for so long really underlines our weakness.

Daniele Mandelli
Daniele Mandelli (@guest_860835)
15 minutes ago
Reply to  Frank62

Surface threats should be primarily dealt with by air assets.
So an air launched ASM.

John
John (@guest_860811)
2 hours ago

Still, one is better than none. Time to really kick some arse over this issue. And a few others. Given the incompetence of politicians, MoD, Treasury and other clowns in the circus? Don’t hold your breath.

Nick Paton
Nick Paton (@guest_860812)
2 hours ago

Congratulations!

Mark T.
Mark T. (@guest_860823)
1 hour ago

Is it a lack of serviceable submarines or the lack of sailors to run them?

Levi Goldsteinberg
Levi Goldsteinberg (@guest_860824)
1 hour ago
Reply to  Mark T.

None – it’s dock infrastructure that coincidentally broke down or is being replaced at the same time