Prowling the seas in slivers of steel -- Time of trial for an awesome new weapon -- A desperate campaign of ruse and disguise -- Final blows of the first U-boat war (A clandestine crop of subs for the next round) -- A daredevil thrust at the Royal Navy's heart (Durance vile in the belly of a submarine) -- The gray wolves' Happy Time (Joyous homecomings for the undersea heroes) -- Descent into nightmare (Bloodied but unbeaten, the sea knights dismount).