It was learning how to live, think, and act in the narrow, uncomfortable space between them, where every important decision is made before anyone knows the whole truth.… By the time the alert reached the National Maritime Risk Coordination Center, it had already spread through encrypted messaging apps, shipping forums, and social media. “Possible submarine landslide detected east of the Izu–Bonin Trench. Tsunami risk under evaluation.” No government agency had issued an evacuation order. No seismic network had confirmed an earthquake large enough to generate a destructive wave. No ocean-bottom pressure sensor had yet reported an anomaly. Yet fishing cooperatives from Chiba to Shizuoka were already asking the same question. “Do we bring everyone back now, or wait for confirmation?” Dr. Aiko Nishimura, a specialist in decision science, looked at the incoming data wall. Most people imagined disaster management as a process of di...