All three powers were limited to 52,700 tons of submarines, but Japan could concentrate in the Pacific while America divided forces between two oceans and Britain served four major theaters. Japan's 105,500 tons of destroyers could likewise create local superiority against dispersed Anglo-American fleets. The segment distinguishes paper strength from forces actually present where a crisis occurs, a central issue in both deterrence and global fleet design. That gap between allocated tonnage and force available on station explains why nominal parity could fail as both a deterrent and a tool of day-to-day influence.
Notable Point · 1:04:22-1:06:53
Equal submarine tonnage masks unequal global missions
Britain, America, and Japan received equal submarine tonnage even though their fleets had radically different geographic commitments.