German agents infiltrate an Iceland port used by the US Navy for anti-sub patrols protecting convoys. Their goal is to block the harbor and trap the patrols. The officers in charge must stop... Read allGerman agents infiltrate an Iceland port used by the US Navy for anti-sub patrols protecting convoys. Their goal is to block the harbor and trap the patrols. The officers in charge must stop the plot before the subs are left unchecked.German agents infiltrate an Iceland port used by the US Navy for anti-sub patrols protecting convoys. Their goal is to block the harbor and trap the patrols. The officers in charge must stop the plot before the subs are left unchecked.