unfortunately Electric boat builds sub sections in Quonset then barges them to New London for assembly, is the only sub production on the east coast.
Doesn't Newport News still build subs?
I don't pay that close of attention to it anymore. Growing up my dad worked at EB and Newport News was always the enemy when contract time came around. I know there was at least one class of subs that was a joint venture between the two (Seawolf?), but I was out of the house by then.
Clearly, you have never heard of Newport News Shipbuilding, which not only builds nuclear submarines, but is the only yard to build US aircraft carriers. It is a division of Huntington Ingalls Industries.