Crew members of the submarine USS Indiana stand during the christening of the Virginia-class submarine Indiana at Newport News Shipbuilding Saturday morning April 29, 2017.

The Indiana — or SSN-789 — is the 16th boat in the Virginia class of nuclear-powered subs being built. A total of 14 former Navy sailors from the last USS Indiana, the BB-58, a World War II-era battleship attended the christening. All in their 90s, they are among the roughly 60 or so men left from the original crew of 2,300. Vice President Mike Pence, who was governor of Indiana before becoming vice president, will keynote Saturday’s event celebrating the Hoosier State’s namesake vessel. The $2.5 billion, 377-foot Indiana will be delivered to the Navy in early 2018.