The Fourth Fleet incident of 1935 extended the warning from Tomozuru across much of the Japanese fleet. Heavy seas tore bows from new destroyers, cracked major cruiser hulls, damaged carrier flight decks and air groups, and flooded part of Ryūjō's hangar. The consequences included deaths and costly demands on yard time, infrastructure, and industrial output across many ship types. Naval architects had already warned that treaty displacement ceilings and ambitious requirements could not be reconciled honestly. The storm forced the navy to accept that structural strength was combat capability, because a fleet disabled by weather would not be available when an enemy arrived.
Chapter · 32:14-36:24
The Fourth Fleet storm becomes an industrial crisis
The 1935 Fourth Fleet incident damaged destroyers, cruisers, carriers, and auxiliaries, forcing Japan to spend scarce yard capacity strengthening much of its fleet.