Robert Ogg, a special Navy investigator for San Francisco's Twelth Naval District, holds up a piece of the proof. Ogg located Japanese warships in the North Pacific by radio-direction-finder bearings in the week before Pearl Harbor. Some historians have discounted Ogg's claim, but here he points to confirmation that the flagship of Japan's Pearl Harbor force, the carrier HIMJS Akagi, broke radio silence on November 30 to contact ships in the tanker train. In doing so, the Akagi revealed its position to the US Navy's intercept operators. "The only tactical circuit heard today," reads the report, "was one with AKAGI and several MARUS." On that day the Akagi was near the international date line in the North Pacific.
