Feeds

Brit, French nuke subs collide - fail to 'see' each other

Expensive undetectable machines undetected - shock

Mobile application security vulnerability report

Updated British and French nuclear missile submarines collided earlier this month beneath the Atlantic, according to reports. Much is being made of the fact that the two subs "failed to see each other", but this is actually quite normal.

The story appears to have first broken with a report in the Sun, stating that HMS Vanguard has been "towed" into her home base at Faslane with "dents and scrapes visible on her hull". It was understood that the nuclear powered, nuclear armed vessel had collided early this month with the French Triomphant, also an ICBM-carrying sub.

The MoD said there had at no time been a break in the British deterrent, but this doesn't mean Vanguard wasn't seriously damaged. The UK now has relaxed rules on maintenance of the deterrent, not requiring a working boat at sea uninterruptedly. Both navies, however, insist there was no damage to anything nuclear, reactors or missiles.

Most of the media have followed the BBC's comment "despite being equipped with sonar, it seems neither vessel spotted the other". But in fact this is not at all unusual.

All submarine captains prefer to refrain from driving about beneath the oceans with their sonar "pinging" sound pulses into the water - this is known as "active" sonar. The pings give a sub's position away, so active sonar is generally only used in special circumstances.

Nuclear-missile subs, whose primary imperative is to remain undetected, are even less likely than normal ones to turn on active sonar. Even where there is no state of war, once a deterrent sub is being tracked by a foreign navy, it is no longer much of a deterrent as it can be attacked and sunk before it will be able to launch its missiles.

Where a nation may have only one deterrent sub at sea - as in the case of Britain and France - the imperative to remain undetected remains even stronger. So neither boat will have been using active sonar, we can be sure.

There remains passive sonar, where one merely listens for the machinery and propulsion noises made by other vessels. But modern Western submarines are deliberately made very quiet in operation - so much so that they are very difficult indeed to detect using passive sonar, and subhunting surface ships are now moving to new forms of active kit.

Vanguard and Triomphant, deterrent subs belonging to competent navies, will be very quiet indeed. If both were patrolling very slowly and listening as hard as possible they might still miss each other entirely. Alternatively, if they were going faster their own speed would tend to blind their passive sonar, and they would still not turn on active equipment and announce their location to the whole ocean.

After all, the whole reason that nations expensively put nuclear missiles on submarines is that it's the only reliable way of making it impossible for anyone to know where the missiles are. Nobody should be surprised at two purposely-designed undetectable launch platforms having remained undetected.

This inability of quiet Western submarines to see each other, especially when moving at speed, has led to the setting-up of a joint traffic-control system by the US and UK, in which submarines are given deconflicted, preplanned moving boxes of sea within which to stay. This avoids British and American boats crashing into each other.

The US and UK trust each other enough to disclose where their subs are, even on occasion their nuclear deterrent boats. Your correspondent isn't aware how closely France participates in/cooperates with this system: on the evidence of the current reports, perhaps not closely enough. ®

Update

At an event held in London this morning, Admiral Sir Jonathan Band (the First Sea Lord, head of the Royal Navy) told reporters including the Reg that both subs were on routine national-deterrent patrols and had hit each other while "moving very slowly". This is a missile boat's normal posture while on deterrent patrol, as it makes the sub as silent and undetectable as possible - evidently quite successfully in this case.

Admiral Band said that damage to Vanguard had been "minor" and the submarine had remained fully able to launch missiles if ordered to. He said she had returned to Faslane "under her own power", contradicting the Sun report. (One should note that it is routine for arriving submarines at Faslane to be accompanied by tugs and assisted into their berths by them, perhaps leading to confusion for the Currant Bun's sources.)

Bridging the IT gap between rising business demands and ageing tools

More from The Register

next story
Just TWO climate committee MPs contradict IPCC: The two with SCIENCE degrees
'Greenhouse effect is real, but as for the rest of it ...'
Adam Afriyie MP: Smart meters are NOT so smart
Mega-costly gas 'n' 'leccy totting-up tech not worth it - Tory MP
'Blow it up': Plods pop round for chat with Commonwealth Games tweeter
You'd better not be talking about the council's housing plans
Arrr: Freetard-bothering Digital Economy Act tied up, thrown in the hold
Ministry of Fun confirms: Yes, we're busy doing nothing
ONE EMAIL costs mining company $300 MEEELION
Environmental activist walks free after hoax sent share price over a cliff
Help yourself to anyone's photos FOR FREE, suggests UK.gov
Copyright law reforms will keep m'learned friends busy
Apple smacked with privacy sueball over Location Services
Class action launched on behalf of 100 million iPhone owners
UK government officially adopts Open Document Format
Microsoft insurgency fails, earns snarky remark from UK digital services head
prev story

Whitepapers

Implementing global e-invoicing with guaranteed legal certainty
Explaining the role local tax compliance plays in successful supply chain management and e-business and how leading global brands are addressing this.
Consolidation: The Foundation for IT Business Transformation
In this whitepaper learn how effective consolidation of IT and business resources can enable multiple, meaningful business benefits.
Application security programs and practises
Follow a few strategies and your organization can gain the full benefits of open source and the cloud without compromising the security of your applications.
How modern custom applications can spur business growth
Learn how to create, deploy and manage custom applications without consuming or expanding the need for scarce, expensive IT resources.
Securing Web Applications Made Simple and Scalable
Learn how automated security testing can provide a simple and scalable way to protect your web applications.