The USS District of Columbia will be among the most expensive ships in U.S. history, when the nuclear submarine launches years from now into the Thames River at a projected cost of $16 billion, at last report. The South Yard assembly building at General Dynamics Electric Boat — dubbed Building 600 — has been assigned an appraised value of nearly $640 million for the October 2023 grand list, according to the town of Groton’s tax assessor. That increases the value of the 75-acre shipyard campus by roughly 60% on paper, to more than $1.6 billion. General Dynamics built the “shed” facility for assembly of the Columbia-class ballistic missile submarine, which the U.S. Navy plans to phase in as the replacement for its existing, Ohio-class subs nearing the end of their planned lifecycles. As construction in Groton ramped up between 2019 and 2020, the company reported a $155 million increase in capital expenditures supporting its marine systems segment, which includes Electric Boat and shipyards in Maine and California. Including development costs, the total program is currently projected to cost $130 billion. Once complete, the South Yard assembly building at Electric Boat would likely take on assembly work for a planned attack submarine fleet that, over time, would replace today’s Virginia-class subs.
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