U-class submarine results relative to their small size

The U class is praised for its results relative to the displacement invested in the boats themselves. The suggested comparison divides the tonnage sunk by the combined displacement of the class as built. On that measure, the class is argued to have achieved an exceptionally strong Second World War result. A later clarification gives a standard displacement of about 550 tons per boat. British submarine service was dispersed across several theatres, so its Pacific presence should be considered alongside commitments in the Mediterranean, North Atlantic, Norwegian waters, and Indian Ocean.