Related Clues:

• Maritime hazard in W. W. II
• Subs
• German subs
• WWII subs
• Wolf pack members
• Some subs
• WWII fleet
• World War marine menaces
• WWII craft
• W.W. II wolf pack
• Some WWII crafts
• WWII maritime hazard
• Maritime hazard in WWII
• Threats to World War shipping
• Depth-charge targets