One of the most important features of Fort Jefferson is the original iron Totten Shutters; a uniquely designed and highly engineered defense feature. Ultimately the Totten Shutter became the first time that armor became a standard element of harbor defenses as a result of extensive experimentation and exhaustive study by one man; Joseph G. Totten
Preserving Fort Jefferson provides a unique challenge to National Park Service employees and contractors. The remote marine environment, the logistical difficulties, and the size of the fort conspire to make restoring the fort seem daunting. However, highly skilled contractors are now hard at work to insure that Fort Jefferson will be preserved for future generations.