"The bow of the North Dakota (SSN 784) is nearby, featuring the new Virginia Payload Tube. Two of the new, 87.5-inch diameter tubes, derived from the payload tubes of Ohio-class SSGN guided-missile submarines, will be installed in new submarines from 784 on, replacing the 12 vertical launch system tubes in earlier submarines that can each carry a Tomahawk cruise missile. The new tubes are built at Electric Boat's Quonset Point, R.I., facility and shipped to Virginia. Most major components of the class are barged down the coast to either EB's assembly yard at Groton, Conn., or to Newport News." Ref : Defence News. Apart from "Anything they want" what do you use 2 tubes that size on an SSN for.