The drone-mothership framing shifts the SSN(X) payload calculus away from torpedo stowage toward large-diameter tube compatibility and power generation margins for unmanned vehicle launch and recovery.
If the design locks in Columbia-class diameter to maximize those margins, the per-hull cost estimate of $9 billion will likely prove a floor: Columbia itself ran well above early CBO projections, and a clean-sheet design with greater electrical and hydrodynamic margins than Virginia adds engineering risk that cost models historically underweight.
That cost pressure arrives precisely when the Navy is also funding AUKUS SSN transfers to Australia, putting two nuclear submarine programs in competition for the same industrial base and the same skilled-welder pipeline at Electric Boat.
General Dynamics Electric Boat and Huntington Ingalls Industries face a design competition whose hull geometry is already constrained: the Navy is signaling a Columbia-class diameter, which means tooling and facility investments at Groton and Newport News will need to accommodate a significantly larger pressure hull than the Virginia-class.
At $9 billion per hull by CBO estimate, SSN(X) will consume a disproportionate share of the shipbuilding account in the 2040s — and that math gets worse if Virginia-class production rates remain below plan through the 2030s, leaving a smaller attack-boat fleet to bridge the gap. Milestone A approval by December 2026 is the next checkable gate.
Has the Navy settled on a hull diameter — Columbia-class scale or something between Virginia and Columbia — and has Electric Boat committed to any facility modifications at Groton to accommodate it?
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