The use of the term "submarine '' or "sub '' (after the resemblance of the roll to the shape of a submarine) is widespread. While some accounts source the name as originating in New London, Connecticut (site of the United States Navy 's primary submarine base) during World War II, written advertisements from 1940 in Wilmington, Delaware indicate the term originated prior to the United States ' entry into World War II.
where did the name sub sandwich come from
the resemblance of the roll to the shape of a submarine