Related Clues:

• German submarine
• WWII enemy sub
• "Das Boot" setting
• WWII German sub
• ''Das Boot,'' for one
• Liner threat, once
• Depth charge target
• World War II sub
• "The Enemy Below" threat
• Convoy chaser
• WWII submarine
• Sub with sauerkraut?
• W.W. II blockade enforcer
• Destroyer hunter
• Torpedo launcher