On August 29, 1915, the United States Navy did what no one thought possible. It raised a sunken submarine from 300 feet of water and brought her crew home. The recovery of the USS F-4 was born out of tragedy, but it became a landmark in naval engineering and a testament to the determination of sailors and divers who refused to yield to the sea. The echoes of that day still resonate in every modern submarine rescue system, in every dive that pushes the limits of depth, and in the enduring commitment of the Navy to its own.