: The rivalry between the inexperienced Captain Klaus Hoffmann and his seasoned, ambitious First Watch Officer, Karl Tennstedt , escalates. Tennstedt openly resents Hoffmann for his family pedigree, while the crew’s faith in their captain wavers following a tragic accident that cost a crewman his arm during torpedo loading.

: Tensions are further fueled by the presence of Samuel Greenwood , an American prisoner/passenger who irritates the officers with his brash attitude. Rumors circulate among the crew regarding his identity and the true cost of their mission.

Onboard the U-612, the crew is reeling from a disastrous confrontation with the enemy that has left their unity at a breaking point.