Royal Navy Submarine In Incident With Ferry Identified
Britain’s Marine Accident Investigation Branch has
published a report on a 2018 near miss between a Royal Navy submarine and a passenger ferry. The ferry is named, obviously, but the submarine is not. Based on the images of the mast, however, we can identify the type of submarine involved.
The mast matches the type found on a Vanguard Class ballistic missile submarine.
Submarine expert Richard W. Stirn specializes in documenting submarine masts and sensors. He identified it as the CK51 optronics mast made by Thales. This is like a digital periscope, and it is found aboard the Vanguard class. Other Royal Navy submarines, of the Astute Class and Trafalgar Class, have different masts.
Recognizing a submarine based solely on its mast is a skill used by navies. If you imagine that you are in a patrol aircraft, the masts might be the only part of the enemy submarine which you can see. These same skills can be applied here.
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A diagram of the mast arrangement of the Royal Navy's Vanguard Class Submarine. Note that generally ... [+]
The incident involved the ferry Stena Superfast VII, which was crossing the North Channel between Belfast in Northern Ireland and Cairnryan in Scotland. The report concludes, “This incident happened because the submarine’s control room team overestimated the ferry’s range and underestimated its speed.” The submarine was conducting routine pre-deployment safety training.
In nautical terms, the area where the submarine incident occurred is known as Area Beaufort. The ferry had 215 passengers and 67 crew on board. The submarine may have had around 130 crew aboard for normal operations. The two vessels came within 250 yards of each other, which is considered unsafe.
The Vanguard class boats, termed ‘bombers’ in Navy parlance (or ‘boomers’ in the U.S. Navy), carry the country’s nuclear deterrence. At least one Royal Navy bomber has been a sea every hour of every day for the past 50 years. This is termed the Continuous At Sea Deterrent (CASD).
The 17,500-ton submarine can carry up to 16 Trident-II D5 intercontinental ballistic missiles. Exact details about these missiles is classified but they are known to have a range in excess of 7,500 miles and can carry multiple nuclear warheads. To put the submarine’s firepower into perspective, it is considered enough to deter other countries from launching a nuclear strike. In other words, a single retaliatory strike from this submarine would guarantee a cost which is unacceptably high to the attacker.
It is not the first time that one of Britain's Vanguard submarines has come close to disaster. In February 2009 the lead boat, HMS Vanguard, collided with the French 'bomber' Triomphant. Both submarines were submerged, and thanks to their high degree of stealth, they were, it seems, unaware of the other. Fortunately both boats came out relatively unscathed.
Submarine incidents are mercifully rare. However they are potentially serious and investigations like this are essential, and testament of how seriously it is taken. The risks to the submarine are equal, or greater, than to the ferry. And thanks to a fleeting glimpse of the masts, we know which class of submarine was involved.
An accident investigation report has been published into a near miss between a Royal Navy submarine and a passenger ferry. It does not name the submarine. Based on the images of the mast, however, we can identify the type of submarine involved.
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