WWII military transport

• Vessel that's short for Unterseeboot
• WWII submarine
• Weaponized sub of WWII
• Wolf pack member of W.W. II
• Avoider of charges?
• Vessel included in the so-called "Plan Z"
• German craft
• Sea prowler
• Note circling reptile is a threat, in the main

Wikipedia Word definitions in Wikipedia
redirect U-boat