This episode's subject matter—the Atlantic convoys and battles with the U-boats—continues from EP1. Chronologically, it picks up after EP2 with President Roosevelt's declaration of war. There are three U-boat strikes here—the first at 7:12 is upon an oil tanker off America's eastern seaboard, south of New York; a second attack at 16:20 is east of Newfoundland in the mid-ocean gap beyond the coverage offered by Canada's land-based planes. The third U-boat assault is around 22:00, much farther east in the Atlantic. The subject convoy's destination is presumably Liverpool, the Allies’ arrival port for “HX” convoys which at first originated in Halifax, Nova Scotia. As the convoy ships near their destination they’re threatened not only by Germany's U-boats, but also by its land-based airplanes.

Bennett recorded EP3 on 2 April 1952, one day before EP2. In the three weeks since his first recording session, EP1's on 12 March, a few musical changes had been made that would hold for the rest of the series. Bennett added two more woodwinds, a second oboe (also assuming English horn duties) and a second bassoon. Also, he revised his original orchestration for Victory’s one-minute SONG-SEAS title sequence around this time, which became the final version heard on all succeeding episodes.

Victory's EPs 1, 2, and 3 were the first three programs completed. Available to Bennett were Rodgers's SONG-SEAS, SUB, and DEATH-DEBRIS based on scenes in EP1. If EP2's HAWAII was also in Bennett's hands when scoring EP3, it would be useless here in the Atlantic. The initial three Rodgers themes are used generously, especially SONG-SEAS and SUB.

Victory's EP3 opens on 8 December 1941, the day after the Pearl Harbor attack, with President Roosevelt's war-declaration speech to Congress. Japan, however, never again figures in this program, meaning no J-tunes to be heard. Early in EP3, the US ramps up production of war goods destined for convoys forming up on America's eastern seaboard from ports in Texas, Louisiana, and Florida. Their eventual destination is England, as were such Atlantic convoys even before Pearl Harbor. The vessels are menaced early on by German U-boats, which operate shockingly close to America's eastern shoreline. Later, nearing the end of the convoy's journey, France-based German aircraft threaten the cargo ships and their escorts. A timely matter is Germany's declaration of war with the US just days after Pearl Harbor, eliminating American ships’ claims to neutrality.