A group of Cleveland residents formed the Cleveland Coordinating Committee to Save "Cod", Inc., with the goal of preserving the ship as a memorial. In 1976 January, the U.S. Navy gave guardianship of the submarine to the group. "Cod" opened for public tours as a floating memorial in 1976 May. In 1986, the U.S. Department of the Interior designated "Cod" a National Historic Landmark. The memorial is open daily between 1 May and 30 September of each year from 1000 to 1700 hours.