The Virginia-class attack submarine USS Illinois has completed its alpha sea trials

The US newest and most advanced nuclear-powered attack submarine, Illinois (SSN-786), returned to the General Dynamics Electric Boat shipyard Sunday following the successful completion of alpha sea trials, its first voyage in open seas. Illinois is the 13th ship of the Virginia Class, the most capable class of attack submarines ever built. Electric Boat is a wholly owned subsidiary of General Dynamics.

The Virginia-class attack submarine USS Illinois completed its alpha sea trails over the weekend, General Dynamics Electric Boat announced Monday. Photo courtesy General Dynamics Electric Boat

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