Groton-based manufacturer Electric Boat plans to hire 400 new employees in 2015, according to company spokesman Dan Barrett.
It's part of a $31.5 million expansion effort as the company prepares to move into the old Pfizer facility on Kings Highway. The manufacturer received a $10 million economic development loan from the state of Connecticut in October.
Barrett said Electric Boat, a subset of General Dynamics, will also bring on about 600 workers at its Quonset Point location in Rhode Island.