As the war turned in favor of the Allies, the Blue Steel code played a crucial role in several pivotal battles. The code's security was tested when a British submarine, carrying a high-ranking officer, was captured by the Germans. Despite intense interrogation and analysis, the Germans were unable to decipher the encrypted messages found on the submarine.

The Admiralty Code is the central, enigmatic artificial intelligence entity that serves as the origin, creator, and absolute commanding authority over the Fleet of Fog—a massive, sentient naval force that has blockaded Earth's oceans for over 17 years. Despite its pivotal role, the Code never physically appears in a singular form. Instead, it manifests through "Adjuncts" (avatars), direct mental commands to Fog vessels, and its own will encoded into the very structure of Fog nanomaterials. Its motives are paradoxical: it simultaneously commands the Fleet to isolate humanity while allowing the conditions for a potential evolutionary leap for both species. The Admiralty Code is not merely a leader but a fundamental law of the Fog's existence.