[178]   Communication Intelligence Summary, December 6, 1941
 
General.-Traffic volume very heavy with a great deal of old traffic  being transmitted. Messages as far back as 1 December were seen in the  traffic. This not believed an attempt to maintain a high traffic level  but is the result of confusion in traffic routing with uncertainty of  delivery. The stations now holding broadcasts are TOKYO (with 3 distinct  and separate broadcasts), SAIPAN, OMINATO and TAKAO.
Yesterday's high level of traffic from TOKYO originators was maintained  with the Intelligence activity still sending periodic messages.  Practically all of TOKYO's messages carry prefixes of high priority.
Combined Fleet.-Still no traffic from the Second and Third Fleet  Commanders. These units are sending their traffic via the TAKAO and  TOKYO broadcasts. The Commander in Chief Combined Fleet originated  several messages to the Carriers, Fourth Fleet and the Major Commanders.
Fourth Fleet.-The Commander in Chief Fourth Fleet is again in the TRUK  area. It is doubtful that he ever went to JALUIT although it is certain  that some members of his staff were there over the past few days. There  is a definite close association between the Third Base Force at PALAO  and the forces in South China. This unit is constantly sending messages  to the Chief of Staff the Second Fleet, Third Fleet, Indo-China Forces  and BAKO. It is being almost entirely neglected by Commander in Chief  Fourth Fleet under whose command it normally operates. RONGELAB radio  addressed the PALAO weather observer.
Fifth Fleet.-This fleet appears dispersed about the JAPAN Sea with  OMINATO broadcasting traffic for this unit.
Submarines.-The Commander Submarine Force originated two messages to his  command. These are the first two originated since 1 December. He is  definitely in the MARSHALLS.
South China.-Nothing new to report. BAKO, SAMA and TAKAO still sending  many messages to the Task Force.
 

(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)