Columbia: The US Navy's new sub where, in terms of missiles, less definitely means more
Work is well underway on the US Navy's next-generation of nuclear-powered ballistic missile submarines – the Columbia class.
Construction of the first boat is well advanced, with 12 on order and two others also in production.
They are the largest of their kind ever constructed for the US Navy, together fielding 70% of America's nuclear arsenal once they are fully operational.
A four-pack with a difference
The keel of the first boat was laid in 2022 in a race against the clock to create a new fleet and class to replace all 14 ageing Ohio-class Trident missile submarines.
These subs are set to retire at a rate of one per year after reaching the end of their 42-year service life.
The new class of submarine will have a displacement of 20,810 long tons when submerged. Each will be 560ft long, with a 43ft diameter hull.
Columbia-class submarines will have just 16 launch tubes instead of the 24 fielded by the Ohio-class boats.
But that's not a downgrade, as the more advanced Trident II D5 (LE) missiles it will carry are superior to the old ones, meaning less is more.
To make modular assembly fast and efficient, the launch tubes are factory-made in clusters of four. These quad-pack designs allow more room for new technologies to be included with the decks, systems and other equipment.
It's understood that the Royal Navy's new Dreadnought-class ballistic missile submarines will share the same launch tube design.
X marks the spot – to control the boat
Another feature of the Columbia-class boats is their X-shaped stern control surfaces, borrowed from the Virginia-class submarines.
They give a submarine rapid, agile manoeuvrability, making it a natural choice for the Columbia class, giving this goliath superior agility for a sub two-and-a-half times bigger than the Virginia class.
This design also helps reduce the boat's acoustic signature and gives better redundancy should a control surface fail. There are also fin-mounted dive planes.
Here are a few more facts and figures:
:: Top Speed: 20+ knots
:: Diving depth: 800+ feet
:: Propulsion: nuclear, electric drive
No need to refuel
Each Columbia-class submarine has what its makers call a "life-of-ship" reactor, eliminating the need for refuelling, while each Ohio-class boat needed midlife nuclear refuelling, costing it two years of lost service.
The Columbia-class will be unencumbered by this need, gaining all 12 boats an extra 24 years of continuous service.
General Dynamics Electric Boat, which built the Ohio-class submarines, is handling most of the construction and final assembly, while Huntington Ingalls Industries handles a portion of the design and construction.
The first submarine in the class, USS District of Columbia, is almost 70% complete, the second, USS Wisconsin, is 35% done, while the third, USS Groton, is 10% finished.
Columbia-class boats are crucial to maintain the US Navy's submarine forces, and this multibillion-dollar programme, having navigated rising costs and delays, must now stay full ahead to meet all the delivery deadlines.
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