Wednesday, February 4, 2009

A new historic physics record has been set by scientists for exceedingly small writing, opening a new door to computing‘s future. Stanford University physicists have claimed to have written the letters “SU” at sub-atomic size.

Graduate students Christopher Moon, Laila Mattos, Brian Foster and Gabriel Zeltzer, under the direction of assistant professor of physics Hari Manoharan, have produced the world’s smallest lettering, which is approximately 1.5 nanometres tall, using a molecular projector, called Scanning Tunneling Microscope (STM) to push individual carbon monoxide molecules on a copper or silver sheet surface, based on interference of electron energy states.

A nanometre (Greek: ?????, nanos, dwarf; ?????, metr?, count) is a unit of length in the metric system, equal to one billionth of a metre (i.e., 10^-9 m or one millionth of a millimetre), and also equals ten Ångström, an internationally recognized non-SI unit of length. It is often associated with the field of nanotechnology.

“We miniaturised their size so drastically that we ended up with the smallest writing in history,” said Manoharan. “S” and “U,” the two letters in honor of their employer have been reduced so tiny in nanoimprint that if used to print out 32 volumes of an Encyclopedia, 2,000 times, the contents would easily fit on a pinhead.

In the world of downsizing, nanoscribes Manoharan and Moon have proven that information, if reduced in size smaller than an atom, can be stored in more compact form than previously thought. In computing jargon, small sizing results to greater speed and better computer data storage.

“Writing really small has a long history. We wondered: What are the limits? How far can you go? Because materials are made of atoms, it was always believed that if you continue scaling down, you’d end up at that fundamental limit. You’d hit a wall,” said Manoharan.

In writing the letters, the Stanford team utilized an electron‘s unique feature of “pinball table for electrons” — its ability to bounce between different quantum states. In the vibration-proof basement lab of Stanford’s Varian Physics Building, the physicists used a Scanning tunneling microscope in encoding the “S” and “U” within the patterns formed by the electron’s activity, called wave function, arranging carbon monoxide molecules in a very specific pattern on a copper or silver sheet surface.

“Imagine [the copper as] a very shallow pool of water into which we put some rocks [the carbon monoxide molecules]. The water waves scatter and interfere off the rocks, making well defined standing wave patterns,” Manoharan noted. If the “rocks” are placed just right, then the shapes of the waves will form any letters in the alphabet, the researchers said. They used the quantum properties of electrons, rather than photons, as their source of illumination.

According to the study, the atoms were ordered in a circular fashion, with a hole in the middle. A flow of electrons was thereafter fired at the copper support, which resulted into a ripple effect in between the existing atoms. These were pushed aside, and a holographic projection of the letters “SU” became visible in the space between them. “What we did is show that the atom is not the limit — that you can go below that,” Manoharan said.

“It’s difficult to properly express the size of their stacked S and U, but the equivalent would be 0.3 nanometres. This is sufficiently small that you could copy out the Encyclopaedia Britannica on the head of a pin not just once, but thousands of times over,” Manoharan and his nanohologram collaborator Christopher Moon explained.

The team has also shown the salient features of the holographic principle, a property of quantum gravity theories which resolves the black hole information paradox within string theory. They stacked “S” and the “U” – two layers, or pages, of information — within the hologram.

The team stressed their discovery was concentrating electrons in space, in essence, a wire, hoping such a structure could be used to wire together a super-fast quantum computer in the future. In essence, “these electron patterns can act as holograms, that pack information into subatomic spaces, which could one day lead to unlimited information storage,” the study states.

The “Conclusion” of the Stanford article goes as follows:

The team is not the first to design or print small letters, as attempts have been made since as early as 1960. In December 1959, Nobel Prize-winning physicist Richard Feynman, who delivered his now-legendary lecture entitled “There’s Plenty of Room at the Bottom,” promised new opportunities for those who “thought small.”

Feynman was an American physicist known for the path integral formulation of quantum mechanics, the theory of quantum electrodynamics and the physics of the superfluidity of supercooled liquid helium, as well as work in particle physics (he proposed the parton model).

Feynman offered two challenges at the annual meeting of the American Physical Society, held that year in Caltech, offering a $1000 prize to the first person to solve each of them. Both challenges involved nanotechnology, and the first prize was won by William McLellan, who solved the first. The first problem required someone to build a working electric motor that would fit inside a cube ¹/₆₄ inches on each side. McLellan achieved this feat by November 1960 with his 250-microgram 2000-rpm motor consisting of 13 separate parts.

In 1985, the prize for the second challenge was claimed by Stanford Tom Newman, who, working with electrical engineering professor Fabian Pease, used electron lithography. He wrote or engraved the first page of Charles Dickens’ A Tale of Two Cities, at the required scale, on the head of a pin, with a beam of electrons. The main problem he had before he could claim the prize was finding the text after he had written it; the head of the pin was a huge empty space compared with the text inscribed on it. Such small print could only be read with an electron microscope.

In 1989, however, Stanford lost its record, when Donald Eigler and Erhard Schweizer, scientists at IBM’s Almaden Research Center in San Jose were the first to position or manipulate 35 individual atoms of xenon one at a time to form the letters I, B and M using a STM. The atoms were pushed on the surface of the nickel to create letters 5nm tall.

In 1991, Japanese researchers managed to chisel 1.5 nm-tall characters onto a molybdenum disulphide crystal, using the same STM method. Hitachi, at that time, set the record for the smallest microscopic calligraphy ever designed. The Stanford effort failed to surpass the feat, but it, however, introduced a novel technique. Having equaled Hitachi’s record, the Stanford team went a step further. They used a holographic variation on the IBM technique, for instead of fixing the letters onto a support, the new method created them holographically.

In the scientific breakthrough, the Stanford team has now claimed they have written the smallest letters ever – assembled from subatomic-sized bits as small as 0.3 nanometers, or roughly one third of a billionth of a meter. The new super-mini letters created are 40 times smaller than the original effort and more than four times smaller than the IBM initials, states the paper Quantum holographic encoding in a two-dimensional electron gas, published online in the journal Nature Nanotechnology. The new sub-atomic size letters are around a third of the size of the atomic ones created by Eigler and Schweizer at IBM.

A subatomic particle is an elementary or composite particle smaller than an atom. Particle physics and nuclear physics are concerned with the study of these particles, their interactions, and non-atomic matter. Subatomic particles include the atomic constituents electrons, protons, and neutrons. Protons and neutrons are composite particles, consisting of quarks.

“Everyone can look around and see the growing amount of information we deal with on a daily basis. All that knowledge is out there. For society to move forward, we need a better way to process it, and store it more densely,” Manoharan said. “Although these projections are stable — they’ll last as long as none of the carbon dioxide molecules move — this technique is unlikely to revolutionize storage, as it’s currently a bit too challenging to determine and create the appropriate pattern of molecules to create a desired hologram,” the authors cautioned. Nevertheless, they suggest that “the practical limits of both the technique and the data density it enables merit further research.”

In 2000, it was Hari Manoharan, Christopher Lutz and Donald Eigler who first experimentally observed quantum mirage at the IBM Almaden Research Center in San Jose, California. In physics, a quantum mirage is a peculiar result in quantum chaos. Their study in a paper published in Nature, states they demonstrated that the Kondo resonance signature of a magnetic adatom located at one focus of an elliptically shaped quantum corral could be projected to, and made large at the other focus of the corral.

Wednesday, October 15, 2008

The UK Government has stated that children in Britain will no longer be required to take compulsory, externally marked tests at the age of fourteen.

The change takes effect immediately, meaning that children who were due to take the test this year no longer have to do so.

Secretary of State for Children, Schools and Families Ed Balls yesterday announced his plans to radically change the UK testing system, in parliament.

Currently, almost ten million tests are sat each year by British pupils. This change is expected to cut the number of tests taken in half, according to The Guardian.

The tests for seven and eleven year olds are not being abolished. A review group is being set up, however, to research the effect of these tests on eleven-year-olds.

Instead of league tables showing test results, the government will produce report cards for secondary schools. According to Ed Balls, the results from GCSEs will be adequate to judge the performance of schools by their test results.

The decision to abolish the tests for fourteen year olds came as a result of a situation earlier this year, when there were long delays with the delivery of test results to students of this age.

According to Christine Blower, acting general secretary of the National Union of Teachers, the government is admitting that the previous test system failed by making this move.

“For too long English, mathematics and science teachers in secondary schools have found themselves skewing everything to enable their pupils to jump through a series of unnecessary hoops,” she claimed, while Chris Keates, general secretary of the National Association of Schoolmasters Union of Women Teachers, said that “the sound of a deep collective sigh of relief will emanate from secondary schools across the country.”

Both major UK opposition parties welcomed this move. Conservative Shadow Secretary of State for Children Michael Gove stated that his party have “argued for fewer national tests and more rigor and we want to work constructively to improve the assessment and qualifications regime.”

David Laws, Shadow Secretary of State for Children for the Liberal Democrats, said that “the Sats tests taken by 14-year-olds are not only a waste of time but have been highly unreliable over the last few years.”

Sunday, June 26, 2005

The median house price in the United States plunged 6.5% in May to $217,000. In February of 2005, the median price of a home was $237,300.

The Economist newspaper said in its June 16th issue; “In other words, it looks like the biggest bubble in history.” by way of reference to what is happening with housing prices in the USA and much of Europe.

Japan provides an example of how a boom can turn to bust. Property prices have dropped for 14 years in a row (40% from their peak in 1991); and yet, the rise in prices in Japan during the decade before 1991 was less than the increase over the past ten years in most of today’s “housing boom” countries.

The total value of residential property rose by more than $30 trillion over the past five years in developed economies, an increase equivalent to 100% of the combined GDPs of those countries. This increase dwarfs all previous house-price booms and is greater than the global stockmarket bubble in the late 1990s. Much of the recent housing activity is being driven by speculative demand. The National Association of Realtors (NAR) reported that 23% of all American houses bought in 2004 were for investment, not for owners to live in. Another 13% were bought as second homes. NAR also found that 42% of all first-time buyers made no down-payment on their home purchase last year.

Many investors are buying solely because they think prices will keep rising, which is a warning sign of a financial bubble. In Miami, Florida, as many as half of the original buyers resell new apartments even before they are built, and properties can change hands two or three times before somebody finally moves in.

Britain’s Royal Institution of Chartered Surveyors (RICS) reported prices have been falling for ten consecutive months. Forty nine percent of their surveyors reported falling prices in May. This was the weakest report since 1992 during Britain’s previous house-price bust.

Tuesday, February 1, 2011

The president of Egypt has suffered a “devastating blow” after the country’s army announced they would not use force against their own people, who continue to protest against the government tonight. The news came hours after six journalists who reported on the protests were released from custody.

Hosni Mubarak yesterday announced a new cabinet, which does not include several figures who protesters largely do not approve of. Analysts have, however, suggested little had changed within the government; many positions, they say, are filled with military figures.

In a statement broadcast on state media in Egypt, the army said: “To the great people of Egypt, your armed forces, acknowledging the legitimate rights of the people … have not and will not use force against the Egyptian people.” A BBC correspondent in Cairo said the announcement meant it “now seems increasingly likely that the 30-year rule of Mr Mubarak is drawing to a close.”

“The presence of the army in the streets is for your sake and to ensure your safety and wellbeing. The armed forces will not resort to use of force against our great people,” the statement added. “Your armed forces, who are aware of the legitimacy of your demands and are keen to assume their responsibility in protecting the nation and the citizens, affirms that freedom of expression through peaceful means is guaranteed to everybody.”

Earlier today, six journalists from the independent news network Al-Jazeera were released from custody after being detained by police. The U.S. State Department criticized the arrests; equipment was reportedly confiscated from the journalists.

Egyptian officials yesterday ordered the satellite channel to stop broadcasting in the country. Al-Jazeera said they were “appalled” by the government’s decision to close its Egyptian offices, which they described as the “latest attack by the Egyptian regime to strike at its freedom to report independently on the unprecedented events in Egypt.”

In a statement, the news agency added: “Al-Jazeera sees this as an act designed to stifle and repress the freedom of reporting by the network and its journalists. In this time of deep turmoil and unrest in Egyptian society it is imperative that voices from all sides be heard; the closing of our bureau by the Egyptian government is aimed at censoring and silencing the voices of the Egyptian people.”

On Friday, Wikinews reported the government had shut off practically all Internet traffic both out of and into the nation, as well as disrupting cellphone usage. A spokesperson for the social networking website Facebook said “limiting Internet access for millions of people is a matter of concern for the global community.”

A reported 50,000 campaigners, who are demanding the long-time leader step down and complaining of poverty, corruption, and oppression, filled Tahrir Square in Cairo today, chanting “We will stay until the coward leaves.” It is thought 100 people have so far died in the demonstrations. Today there have been protests in Suez, Mansoura, Damanhour, and Alexandria.

Speaking to news media in the area, many protesters said the new cabinet did little to quell their anger. “We want a complete change of government, with a civilian authority,” one said. Another added: “This is not a new government. This is the same regime—this is the same bluff. [Mubarak] has been bluffing us for 30 years.”

In Tahrir Square today, protesters played music as strings of barbed wire and army tanks stood nearby. Demonstrators scaled light poles, hanging Egyptian flags and calling for an end to Mubarak’s rule. “One poster featured Mubarak’s face plastered with a Hitler mustache, a sign of the deep resentment toward the 82-year-old leader they blame for widespread poverty, inflation and official indifference and brutality during his 30 years in power,” one journalist in the square reported this evening.

Friday, August 15, 2008

Jack A. Weil, founder and CEO of Rockmount Ranch Wear died on August 13 at the age of 107 in Denver, Colorado. He was the oldest working CEO in the United States. He was also known as “Papa Jack”.

He was born on March 28, 1901 in Evansville, Indiana. In 1946, Weil rented a space at 1626 Wazee Street in Denver and set about trying to create a fashionable yet practical identity for the western ranchers of the region.

Weil was well-known for coining the phrase “The West is not a place, it is a state of mind.” He was the first person to put snaps on Western shirts, patented the saw-tooth pocket design seen on many Western shirts, and was credited with inventing the bolo tie.

In 2001, he told Associated Press, “I learned fast you can’t sell to cowboys; they have no money. You have to appeal to the cowboy in everyone and sell to them.”

Among his customers were Ronald Reagan, Bob Dylan, Eric Clapton and Nicholas Cage. More recently, Rockmount shirts were worn by the late Heath Ledger and Jake Gyllenhaal in the 2005 Academy Award-nominated movie, Brokeback Mountain.

Weil’s wife, Beatrice Baum, died in 1990, followed by his son Jack B. in January 2008.

“I never wanted to be the richest man in the cemetery,” he told his grandson and current president of the family business.

Tuesday, March 22, 2005

Twenty-four cars of a west-bound Canada Pacific train were thrown from the tracks after the train collided with a semi tractor-trailer in poor weather and visibility near Regina, Saskatchewan around 11 a.m. Tuesday morning. The driver was rushed to hospital.

The accident took place on a level section of Highway 46 just north of Highway 1, about 25 kilometres east of Regina. The RCMP spokesperson reported the crossing is marked with lights, but weather may have played a role.

“Road conditions were wet and sloppy and it’s foggy,” RCMP Cpl. Brian Jones said to the CBC. The bad weather, including a heavy overnight snowfall, may have contributed to the accident.

Most of the 93 cars in the train were empty bulk transit cars, used for moving agricultural products such as grains. The RCMP report that neither train or truck were transporting any hazardous materials.

Wednesday, April 1, 2009

According to reports, a man protesting the G20 Summit in London, England has died after collapsing at a protester camp.

Sky News says the man collapsed on the street inside a camp close to the Bank of England and when found he was still breathing, but efforts by paramedics to rescue him failed and he was pronounced dead at an area hospital. The name of the person and cause of death are not yet known, but several people were injured earlier in the day. The police claim that protestors threw bottles at them while trying to rescue the protestor.

The London Ambulance Service reported that “we received a 999 call at 7:24 pm from a member of the public reporting that a man had fallen over and was unconscious, but was breathing. [They] made extensive efforts to resuscitate him both there and on the way to hospital.”

Earlier in the day a minimum of 20 protesters broke into the bank and according to reports vandalized furniture, broke windows and cut the telephone lines to the building.

Wednesday, February 18, 2009

The Nuclear ballistic missile submarines Triomphant, from France, and HMS Vanguard, of the British Royal Navy, collided deep under the middle of the Atlantic Ocean in the middle of the night between February 3 and 4, despite both vessels being equipped with sonar. The collision caused damage to both vessels but it did not release any radioactive material, a Ministry of Defence (MOD) official confirmed Monday.

A Ministry of Defence spokesman said nuclear security had not been breached. “It is MOD policy not to comment on submarine operational matters, but we can confirm that the U.K.’s deterrent capability was unaffected at all times and there has been no compromise to nuclear safety. Triomphant had struck ‘a submerged object (probably a container)’ during a return from a patrol, damaging the sonar dome on the front of the submarine,” he said.

A French navy spokesman said that “the collision did not result in injuries among the crew and did not jeopardise nuclear security at any moment.” Lack of communication between France and other members of NATO over the location of their SLBM deterrents is believed to be another reason for the crash.

According to Daily Mail, the vessels collided 1,000ft underwater in the Bay of Biscay (Golfe de Gascogne; Golfo de Vizcaya and Mar Cantábrico), a gulf of the North Atlantic Ocean. It lies along the western coast of France from Brest south to the Spanish border, and the northern coast of Spain west to Punta de Estaca de Bares, and is named for the Spanish province of Biscay, with average depth of 5,723 feet (1,744 m) and maximum depth is 9,151 feet (2,789 m).

Each submarine is laden with missiles powerful enough for 1,248 Hiroshima bombings, The Independent said.

It is unlikely either vessel was operating its active sonar at the time of the collision, because the submarines are designed to “hide” while on patrol and the use of active sonar would immediately reveal the boat’s location. Both submarines’ hulls are covered with anechoic tile to reduce detection by sonar, so the boats’ navigational passive sonar would not have detected the presence of the other.

Lee Willett of London’s Royal United Services Institute said “the NATO allies would be very reluctant to share information on nuclear submarines. These are the strategic crown jewels of the nation. The whole purpose of a sea-based nuclear deterrent is to hide somewhere far out of sight. They are the ultimate tools of national survival in the event of war. Therefore, it’s the very last thing you would share with anybody.”

First Sea Lord Admiral Sir Jonathon Band GCB, ADC of the United Kingdom, the most senior serving officer in the Royal Navy, said that “…the submarines came into contact at very low speed. Both submarines remained safe. No injuries occurred. We can confirm the capability remains unaffected and there was no compromise to nuclear safety.”

“Both navies want quiet areas, deep areas, roughly the same distance from their home ports. So you find these station grounds have got quite a few submarines, not only French and Royal Navy but also from Russia and the United States. Navies often used the same nesting grounds,” said John H. Large, an independent nuclear engineer and analyst primarily known for his work in assessing and reporting upon nuclear safety and nuclear related accidents and incidents.

President of the Royal Naval Association John McAnally said that the incident was a “one in a million chance”. “It would be very unusual on deterrent patrol to use active sonar because that would expose the submarine to detection. They are, of course, designed to be very difficult to detect and one of the priorities for both the captain and the deterrent patrol is to avoid detection by anything,” he said.

The development of stealth technology, making the submarines less visible to other vessels has properly explained that a submarine does not seem to have been able to pick out another submarine nearly the length of two football pitches and the height of a three-story building.

“The modus operandi of most submarines, particularly ballistic-missile submarines, is to operate stealthily and to proceed undetected. This means operating passively, by not transmitting on sonar, and making as little noise as possible. A great deal of technical effort has gone into making submarines quiet by reduction of machinery noise. And much effort has gone into improving the capability of sonars to detect other submarines; detection was clearly made too late or not at all in this case,” explained Stephen Saunders, the editor of Jane’s Fighting Ships, an annual reference book (also published online, on CD and microfiche) of information on all the world’s warships arranged by nation, including information on ship’s names, dimensions, armaments, silhouettes and photographs, etc.

According to Bob Ayres, a former CIA and US army officer, and former associate fellow at Chatham House, the Royal Institute of International Affairs, however, the submarines were not undetectable, despite their “stealth” technology. “When such submarines came across similar vessels from other navies, they sought to get as close as possible without being detected, as part of routine training. They were playing games with each other – stalking each other under the sea. They were practising being able to kill the other guy’s submarine before he could launch a missile.Because of the sound of their nuclear reactors’ water pumps, they were still noisier than old diesel-electric craft, which ran on batteries while submerged. The greatest danger in a collision was the hull being punctured and the vessel sinking, rather than a nuclear explosion,” Ayres explained.

Submarine collisions are uncommon, but not unheard of: in 1992, the USS Baton Rouge, a submarine belonging to the United States, under command of Gordon Kremer, collided with the Russian Sierra-class attack submarine K-276 that was surfacing in the Barents Sea.

In 2001, the US submarine USS Greeneville surfaced and collided with Japanese fishing training ship Ehime Maru (????), off the coast of Hawaii. The Navy determined the commanding officer of Greeneville to be in “dereliction of duty.”

The tenth HMS Vanguard (S28) of the British Royal Navy is the lead boat of her class of Trident ballistic missile-capable submarines and is based at HMNB Clyde, Faslane. The 150m long, V-class submarine under the Trident programme, has a crew of 135, weighs nearly 16,000 tonnes and is armed with 16 Trident 2 D5 ballistic missiles carrying three warheads each.

It is now believed to have been towed Monday to its naval base Faslane in the Firth of Clyde, with dents and scrapes to its hull. Faslane lies on the eastern shore of Gare Loch in Argyll and Bute, Scotland, to the north of the Firth of Clyde and 25 miles west of the city of Glasgow.

Vanguard is one of the deadliest vessels on the planet. It was built at Barrow-in-Furness by Vickers Shipbuilding and Engineering Ltd (now BAE Systems Submarine Solutions), was launched on 4 March, 1992, and commissioned on 14 August, 1993. The submarine’s first captain was Captain David Russell. In February 2002, Vanguard began a two-year refit at HMNB Devonport. The refit was completed in June 2004 and in October 2005 Vanguard completed her return to service trials (Demonstration and Shakedown Operations) with the firing of an unarmed Trident missile.

“The Vanguard has two periscopes, a CK51 search model and a CH91 attack model, both of which have a TV camera and thermal imager as well as conventional optics,” said John E. Pike, director and a national security analyst for http://www.globalsecurity.org/, an easily accessible pundit, and active in opposing the SDI, and ITAR, and consulting on NEO’s.File:Triomphant img 0394.jpg

“But the periscopes are useless at that depth. It’s pitch black after a couple of hundred feet. In the movies like ‘Hunt for Red October,’ you can see the subs in the water, but in reality it’s blindman’s bluff down there. The crash could have been a coincidence — some people win the lottery — but it’s much more possible that one vessel was chasing the other, trying to figure out what it was,” Pike explained.

Captain of HMS Vanguard, Commander Richard Lindsey said his men would not be there if they couldn’t go through with it. “I’m sure that if somebody was on board who did not want to be here, they would have followed a process of leaving the submarine service or finding something else to do in the Navy,” he noted.

The Triomphant is a strategic nuclear submarine, lead ship of her class (SNLE-NG). It was laid down on June 9, 1989, launched on March 26, 1994 and commissioned on March 21, 1997 with homeport at Île Longue. Equipped with 16 M45 ballistic missiles with six warheads each, it has 130 crew on board. It was completing a 70-day tour of duty at the time of the underwater crash. Its fibreglass sonar dome was damaged requiring three or four months in Drydock repair. “It has returned to its base on L’Ile Longue in Brittany on Saturday under its own power, escorted as usual by a frigate,” the ministry said.

A Ballistic missile submarine is a submarine equipped to launch ballistic missiles (SLBMs). Ballistic missile submarines are larger than any other type of submarine, in order to accommodate SLBMs such as the Russian R-29 or the American Trident.

The Triomphant class of strategic missile submarines of the French Navy are currently being introduced into service to provide the sea based component (the Force Océanique Stratégique) of the French nuclear deterrent or Force de frappe, with the M45 SLBM. They are replacing the Redoutable-class boats. In French, they are called Sous-Marin Nucléaire Lanceur d’Engins de Nouvelle Génération (“SNLE-NG, literally “Device-launching nuclear submarine of the new generation”).

They are roughly one thousand times quieter than the Redoutable-class vessels, and ten times more sensitive in detecting other submarines [1]. They are designed to carry the M51 nuclear missile, which should enter active service around 2010.

Repairs for both heavily scraped and dented, missile-laden vessels were “conservatively” estimated to cost as much as €55m, with intricate missile guidance systems and navigation controls having to be replaced, and would be met by the French and British taxpayer, the Irish Independent reported.

Many observers are shocked by the deep sea disaster, as well as the amount of time it took for the news to reach the public. ”Two US and five Soviet submarine accidents in the past prove that the reactor protection system makes an explosion avoidable. But if the collision had been more powerful the submarines could have sunk very quickly and the fate of the 250 crew members would have been very serious indeed,” said Andrey Frolov, from Moscow’s Centre for Analysis of Strategies and Technologies.

“I think this accident will force countries that possess nuclear submarines to sit down at the negotiating table and devise safety precautions that might avert such accidents in the future… But because submarines must be concealed and invisible, safety and navigation laws are hard to define,” Frolov said, noting further that there are no safety standards for submarines.

The unthinkable disaster – in the Atlantic’s 41 million square miles – has raised concern among nuclear activists. “This is a nuclear nightmare of the highest order. The collision of two submarines, both with nuclear reactors and nuclear weapons onboard, could have released vast amounts of radiation and scattered scores of nuclear warheads across the seabed,” said Kate Hudson, chair of Britain’s Campaign for Nuclear Disarmament.

“This is the most severe incident involving a nuclear submarine since the Russian submarine RFS Kursk K-141 explosion and sinking in 2000 and the first time since the Cold War that two nuclear-armed subs are known to have collided. Gordon Brown should seize this opportunity to end continuous patrols,” Hudson added. Despite a rescue attempt by British and Norwegian teams, all 118 sailors and officers aboard Kursk died.

“This reminds us that we could have a new catastrophe with a nuclear submarine at any moment. It is a risk that exists during missions but also in port. These are mobile nuclear reactors,” said Stephane Lhomme, a spokesman for the French anti-nuclear group Sortir du Nucleaire.

Nicholas Barton “Nick” Harvey, British Liberal Democrat Member of Parliament for North Devon has called for an immediate internal probe. “While the British nuclear fleet has a good safety record, if there were ever to be a bang it would be a mighty big one. Now that this incident is public knowledge, the people of Britain, France and the rest of the world need to be reassured this can never happen again and that lessons are being learned,” he said.

SNP Westminster leader Angus Robertson MP for Moray has demanded for a government statement. “The Ministry of Defence needs to explain how it is possible for a submarine carrying weapons of mass destruction to collide with another submarine carrying weapons of mass destruction in the middle of the world’s second-largest ocean,” he said.

Michael Thomas Hancock, CBE, a Liberal Democrat Member of Parliament for Portsmouth South and a City councillor for Fratton ward, and who sits on the Commons defence committee, has called on the Ministry of Defence Secretary of State John Hutton to make a statement when parliament sits next week.

“While I appreciate there are sensitive issues involved here, it is important that this is subject to parliamentary scrutiny. It’s fairly unbelievable that this has happened in the first place but we now need to know that lessons have been learnt. We need to know for everyone’s sakes that everything possible is now done to ensure that there is not a repeat of the incident. There are serious issues as to how some of the most sophisticated naval vessels in the seas today can collide in this way,” Mr. Hancock said.

Tory defence spokesman Liam Fox, a British Conservative politician, currently Shadow Defence Secretary and Member of Parliament for Woodspring, said: “For two submarines to collide while apparently unaware of each other’s presence is extremely worrying.”

Meanwhile, Hervé Morin, the French Minister of Defence, has denied allegations the nuclear submarines, which are hard to detect, had been shadowing each other deliberately when they collided, saying their mission was to sit at the bottom of the sea and act as a nuclear deterrent.

“There’s no story to this — the British aren’t hunting French submarines, and the French submarines don’t hunt British submarines. We face an extremely simple technological problem, which is that these submarines are not detectable. They make less noise than a shrimp. Between France and Britain, there are things we can do together….one of the solutions would be to think about the patrol zones,” Morin noted, and further denying any attempt at a cover-up.

France’s Atlantic coast is known as a submarine graveyard because of the number of German U-boats and underwater craft sunk there during the Second World War.