In 1940, the Navy spent $22 million to reopen the yard as Cramp Shipbuilding to build cruisers and submarines.

Cramp used the long slipways to construct two submarines at a time, with the intention of launching them simultaneously.

However, the shipyard's submarine construction program was not especially successful, as poor management hindered the delivery of the boats.

[8] Cramp closed in 1947 and the site, on the Delaware River in Philadelphia's Port Richmond neighborhood, was turned into a residential estate in early 2020s.

Vessels built by the firm that are listed on the U.S. National Register of Historic Places include: