The US Navy is building twelve massive submarines to carry its future nuclear deterrent.

Wars & Conflicts · Published 15 October 2026 Swipe more like this →

In short: The Columbia-class submarine represents a generational shift in American naval power. Designed to replace the aging Ohio-class fleet, these vessels will serve as the backbone of the nation's strategic nuclear force for decades. With advanced electric propulsion and a lifetime nuclear core, they are engineered for unprecedented stealth and endurance.

The Columbia-class program is a massive industrial undertaking intended to maintain the United States' sea-based nuclear deterrent. The Navy plans to build twelve of these submarines, with construction of the lead vessel, the USS District of Columbia (SSBN-826), beginning in 2020. These ships are designed to be 560 feet long, carrying sixteen Trident II D5LE missiles each. While they feature fewer missile tubes than the 24 found on the Ohio-class, they are expected to have a similar submerged displacement and incorporate modern stealth technologies to ensure survivability through their projected 42-year service life.

A defining technical feature of the Columbia class is its electric drive propulsion system. Unlike previous nuclear-powered submarines that rely on mechanical reduction gearing, the Columbia class will use steam turbines to generate electricity, which then powers the propulsion motors. This design choice aims to reduce acoustic signatures and lower lifecycle costs. Furthermore, the submarines are designed with a nuclear fuel core intended to last for the vessel's entire service life, eliminating the need for the expensive mid-life refueling required by the Ohio class. The program also utilizes off-the-shelf components from the Virginia-class attack submarines, such as sonar systems and anechoic coatings, to manage development risks.

The financial scale of the program is significant. The total lifecycle cost for the entire class is estimated at $347 billion, and the construction cost for the twelve-boat program is estimated at $132 billion as of April 2023. General Dynamics Electric Boat serves as the prime contractor, with Newport News Shipbuilding acting as the main subcontractor. The program faces ongoing challenges, including securing supply chains and maintaining a skilled labor force. As the Ohio-class boats are decommissioned starting in 2028, the Columbia class is scheduled to enter service in 2031, with the final boat expected to be completed by 2042 and remain operational until 2085.

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