What is the most underrated submarine class in naval history?
Short answerThe Royal Navy V class, whose combat record includes the only submerged-on-submerged submarine kill, yet remains much less famous than German and American types.
NotesThe V class is the choice for the most underrated submarine class because its obscurity contrasts with its submerged-on-submerged combat achievement. German Type VII and Type XXI boats receive far more attention, often through engineering statistics. A combat record supplies a different basis for comparison. The U class is also praised for the ratio between the tonnage its boats sank and their combined displacement. British submarine operations were spread across the Mediterranean, North Atlantic, Norwegian waters, Indian Ocean, and Pacific, which helps explain why comparatively few could be concentrated in any one theatre.