Electric Boat on Friday marked the start of a major construction project — the biggest to take place in its Groton shipyard in more than 45 years — that will enable the company to build the next class of ballistic missile submarines at the same time it is churning out attack submarines. An $850 million expansion is planned for EB’s Groton headquarters, the centerpiece of which will be a new 200,000-square foot building, where the ballistic missile submarines will be assembled.
https://www.theday.com/military-news/20190913/electric-boat-embarks-on-biggest-construction-project-in-more-than-45-years