[177] Communication Intelligence Summary, December 5, 1941
 
General.-Traffic volume heavy. All circuits overloaded with Tokyo  broadcast going over full 24 hours. Tokyo-Mandates circuit in duplex  operation. There were several new intercept schedules heard. OMINATO  radio working SAMA and BAKO sending fleet traffic. The Takao broadcast  handling traffic Second and Third Fleet while the Tokyo broadcast is  still handling traffic for these units also. It is noted that some  traffic being broadcast is several days old which indicates the  uncertainty of delivery existing in the radio organization.
There were many messages of high precedence which appears to be caused  by the jammed condition of all circuits.
A plain language message was sent by the Captain, OKAWA from Tokyo to  Takao probably for further relay addressed to FUJIHARA, Chief of the  Political Affairs Bureau saying that "in reference to the Far Eastern  Crisis, what you said is considered important at this end but proceed  with what you are doing, specific orders will be issued soon."
Combined Fleet.-Neither the Second or Third Fleet Commanders have  originated any traffic today. They are still frequently addressed but  are receiving their traffic over broadcast. They are undoubtedly in  Takao area or farther south since the Takao broadcast handles nearly all  their traffic. No traffic from the Commander Carriers or Submarine Force  has been seen either.
Third Fleet.-In one WE address a "Chief of Staff" sent a message to  "Commander Fourteenth Army abroad RYUJOMARU in Third Fleet.  HITOYO.GUN.SATI (IRO 1 REUZEU MARU). A number of MARUS have been  addressing the CINC. Third Fleet.
Fourth Fleet.-The Secretary, Fourth Fleet and Staff Communication  Officer the Fourth Fleet were addressed at Jaluit today strengthening  the impression at the CinC. Fourth Fleet is in the Marshalls. The  Commander of the South China Fleet has been addressing Palao radio and  the RNO TAIHOKU and the Commander Second Fleet.
South China.-SAMA addressed much traffic to CinC. Second Fleet. BAKO  continues as an active originator with many dispatches to Second and  Third Fleet. The Commander Combined Air Force appears to be busy with  the movement of Air Corps. SHIOGAMA Air and at least two unidentified  corps are moving, probably to Indo-China.

 

(FROM: U.S. CONGRESS JOINT COMMITTEE ON PEARL HARBOR ATTACK HEARINGS; PT.  35, THE CLAUSEN INVESTIGATION, PP. 62-81. EXHIBIT "A" DAILY COMMUNICATION INTELLIGENCE SUMMARIES)