In March 1934, the new torpedo boat Tomozuru capsized during stormy weather. Her lights disappeared after radio contact was lost, and a search aircraft later found the ship drifting upside down. One hundred of a complement of 113 died, making the stability failure an institutional shock rather than a minor design correction. Investigators quickly identified a hull too lightly built for the vessel's topweight. The disaster gives the immediate safety context for the heavier structure incorporated into later Japanese designs such as Hiryū.
Chapter · 30:08-32:10
Tomozuru exposes the cost of excessive topweight
The 1934 Tomozuru disaster showed that aggressive armament and a lightly built hull could make a new Japanese warship dangerously unstable.