Barbel-class range and the changing SSK mission

Did the Barbel class's diesel-electric propulsion prevent it from serving in distant seas?

No; the class could deploy overseas, but nuclear submarines came to dominate the long-range mission while SSKs specialized in nearer and more confined waters.

The panel rejects the idea that the Barbels' propulsion automatically prevented distant operations. The larger historical change is mission allocation: nuclear attack submarines assumed the sustained oceanic role, while most modern diesel-electric boats became optimized for minefields, coastal defense, and confined waters such as the Baltic or Mediterranean. Extra-large uncrewed vehicles are expected to reinforce that division. Future SSNs may therefore need docking or servicing arrangements for underwater vehicles, turning the crewed submarine into a mobile support node.