| abstract | - 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. The first delivery was made two years after keel laying, and fitting out was then done by Portsmouth Navy Yard. The best construction time for a submarine was 644 days. Cramp closed in 1947 and the site, on the Delaware River in Philadelphia's Port Richmond neighborhood, became an industrial park.
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