The idea that the UK’s
entire command and control apparatus, and even the country as a whole, could be
wiped off the face of the earth in a single nuclear barrage is chilling. Yet it
is this possibility that prompted a dark and sobering tradition among Prime
Ministers following the advent of the UK’s “second strike” nuclear deterrent—their nuclear ballistic
missile submarines.
As soon as a new Prime
Minister takes office, they receive highly classified briefings regarding the
country’s nuclear weapons capabilities—specifically on the massive destruction
that a single Vanguard class nuclear ballistic
missile submarine and its 16 Trident II D5 missiles can convey.
They also hear about the immense amounts death the UK’s potential nuclear
armed adversaries can deliver on a moment's notice.
Afterwards, and in
conjunction with their top military advisor, the Prime Minister pens
four identical letters in their own hand writing outlining instructions on what
to do if a nuclear exchange has occurred and the British government, including
the Prime Minister and a designated second person, has been killed or
incapacitated. Under the worst of circumstances, the Letter of Last
Resort would stand as the last act of Her Majesty’s Government.
Once the letters are written, they are transferred
to the four Vanguard class nuclear ballistic
missile submarines that makeup the UK’s nuclear deterrent. Onboard, they are
stored inside double nested safes and will remain there until the Prime
Minister decides to change the orders or their reign ends. After which time
they will be destroyed in sealed condition so that nobody knows what the orders
were.
During the time following a perceived attack, a
series of progressive checks are made by submarine crews leading up to the
captain opening the letter. These include trying to listen for radio
transmissions from various levels of Royal Navy and Ministry of Defense command
using multiple methods, and most famous of all, listening for new radio
broadcasts by BBC Radio channel four, and specifically new episodes of BBC
Today. If all else fails, following a certain predetermined period of time,
rumored to be a matter of a few days, the skipper of the Vanguard class submarine will move
toward extracting the letter and executing its blind instructions.
Daniel Martyn Commanding Officer of HMS Vigilant next to a safe that contains the Prime Minister's last resort instructions, on board Vanguard class submarine HMS Vigilant (AP photo):
There are a handful of known instructions the
Prime Minister can choose from when penning their Letters of Last Resort, and a
combination of them can also be stated. These commands include retaliate, don’t
retaliate, use your own judgement, put yourself under the command of the US
Navy if it still exists, or go to the same in Australia. Clearly the secrecy
surrounding the letters is key as without knowledge of what the fail-safe
second-strike commands are, the nuclear deterrent remains credible.
If a Prime Minister’s command is to not retaliate,
it may be because they have gamed out that if the letter is opened, the nuclear
deterrent has already failed. Thus raining down more destruction will only
result in more lives lost and lower chances that Earth can recover from the
heavy radiation, fallout and nuclear winter that may follow.
Obviously under most
situations commands to launch would be delivered via an emergency action
message, that can even be conveyed via America's VLF communications
capabilities. The Prime Minister would have just minutes to order a retaliatory
strike through established channels before the enemy’s warheads detonated over
London and other population centers, as well as key government and military
installations around the UK. In a Daily Mail expose, Peter Hennessy and
Richard Knight described the room where this order would be received and pushed
out to the Vanguard class submarine on patrol:
“Were the order to fire to
be given from a still-functioning government, it would come to CTF 345, a
bunker known as ‘The Hole’ at the Northwood facility in Middlesex. There,
inside a perimeter of intense security, a small group of Naval officers sit
waiting for that unlikely communication. We went to CTF 345, the first
journalists ever to visit, to meet those men. They are, like their colleagues
in Vanguard, quietly efficient, businesslike and matter-of-fact.
They explained that the
heavily encrypted message arrives on a computer from wherever the Prime
Minister had issued it — which would most probably be the Government Emergency
Room in a bunker deep beneath the MoD in Whitehall. The officers then collect
codes from two safes attached to the far wall of the ops room. Those safes are
monitored constantly, via CCTV, by Royal Marines.
If anyone approaches them
who is not properly authorised to do so, the Marines will storm the room with
weapons ready. The officers of CTF 345 showed us how they would, in pairs,
authenticate the message and, finally, put it onto the transmission system for
communication to the submarine on patrol, together with the encrypted
coordinates of the designated target.”
Alternatively, if a surprise strike wiped out the
UK’s ability to communicate with their Trident missile equipped boats, one of
which is on patrol in the Atlantic at all times, the Letter of Last Resort can
work as a sort of automated fail-safe response that ensures the second strike
capability is activated as a means of vengeance.
The trigger that fires D5 Trident SLBMs aboard a Vanguard class SSBN. It is made out of the grip of a Colt 45 (AP photo):
Some cite the Letter of Last Resort system as
flawed, not just over the fact that a person who is probably dead is dictating
the fate of millions of lives without knowing the exact details of the
situation, but if submarine commander is ordered to strike, how do they know
exactly who to strike? Not just that, but it seems that glitches in the system
are possible, especially considering that an already isolated submarine’s
ability to gauge who is left alive in Britain, and within the governmental
command authority, in a relatively short period of time no less, is
questionable.
Letters of Last Resort are
not deployed aboard America’s nuclear ballistic missile submarines, but the US,
with it large landmass, extensive command and control infrastructure, and nuclear
triad is more survivable to a sudden nuclear attack than the UK. Only the
President or Vice President can order nuclear weapons release, and that
decision has to be made either very quicklyonce an incoming barrage
is detected, or the hope is that the President or Vice President can survive
the strike, along with Strategic Command’s flying outposts, in order to relay
commands to execute a retaliatory strike.
For more great information on this dark but
fascinating topic, listen to this BBC special “The Humon Button,” it is well
worth your time.
Contact the author
Tyler@thedrive.com
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