The U.S. Navy is advancing development of its next-generation SSN(X) nuclear attack submarine, designed to replace the Virginia-class fleet with greater speed, stealth, firepower, and operational availability. According to USNI News, the new submarine is also expected to serve as a mothership for unmanned underwater vehicles, expanding the Navy’s undersea capabilities.

The Navy is finalizing its analysis of alternatives and hopes to receive approval to begin early development by the end of 2026. Key requirements include increased payload capacity, improved survivability, greater electrical capacity, and the ability to launch and control autonomous underwater systems.

The SSN(X) could displace up to 10,000 tons and carry an estimated average price tag of $9 billion per submarine, according to Congressional Budget Office analysis. Construction is currently projected to begin in the early 2040s.

The development comes as the Navy faces growing undersea competition from China and Russia, including China’s expanding submarine fleet and increased undersea surveillance capabilities.

The SSN(X) represents a major shift in U.S. submarine capabilities, combining greater speed, stealth, and weapons capacity with autonomous underwater technology as the Navy prepares for an increasingly competitive undersea environment.