The Japanese carrier force's sudden silence before Pearl Harbor is treated as a warning that deserved greater attention. A formation that had generated regular exercise traffic had stopped transmitting. In this interpretation, the change indicated that part of a major potential enemy fleet was doing something unusual. The criticism is connected to a broader claim that weak American investment in intelligence during the interwar years left the service unprepared. The radio silence is offered as an indicator of activity, without identifying the attack's destination from silence alone.
Notable Point · 1:45:09-1:46:31
Radio silence as a warning before Pearl Harbor
The sudden silence of a previously active Japanese formation is offered as a warning sign before Pearl Harbor.