It’s 1942 and the war is no longer going well for the German “wolf-packs”—U-boats, tasked with sinking Allied supply ships. They’re vulnerable targets now thanks to the cracking of the Enigma code, ...

From the furniture-rattling opening sequence of a submarine being sunk by depth-charges, these first two episodes (out of eight) were tightly-wound and exuded a powerful atmosphere of menace. The ...