Electric Boat has put millions of dollars into the building where workers assemble submarines.
Monday, the company cut the ribbon on a freight elevator, one of the investments the shipyard has made to begin building one nuclear submarine a year in 2011 in Groton.
The company has put more than $19 million into Building 260, where workers assemble submarines.
It expects to save $80 million in man hours and pass the savings on to its customer, the U.S. Navy, as part of a contract it won last year to build eight Virginia class submarines here and in Virginia..
The elevators will also improve health and safety, he said.