在这部保卫大西洋剧情/爱情/战争片中,美国海军在冰岛的港口建立一个反潜巡逻基地，免受德军U艇的攻击，保证大西洋舰队的畅通。为了阻止美军的护航舰队，纳粹派特工潜入港口，计划炸毁港口的入口，以便阻止护航舰队的巡逻。护航舰队的军官必须揪出间谍，并在他们实施破坏目标
American naval forces are using a port in Iceland as a base for anti-submarine patrols to protect North Atlantic convoys from German subs. The Germans send undercover agents into the port in a scheme to blow up the entrance to the harbor and keep the patrols blocked in. The officers in charge of the patrols have to find the spies and stop them before they achieve their objective.
