Naval History and Heritage Command

1. Archival Copy

SRMD-006

UNITED STATES NAVY
FILE OF SIGTOT MESSAGES FROM
JICPOA ESTIMATES SECTION TO
CINCPAC ADVANCED HEADQUARTERS

RE V BE

NUMBER 277

03 AUGUST

FROM: CAPTAIN LAYTON

TO: CAPTAIN HARPER

IN VIEW OF INDIANAPOLIS RPT INDIANAPOLIS SINKING PROBABLY BY JAPANESE SUBMARINE I-58 AND PROBABILITY THAT THERE WILL BE SOME LOOKING INTO MATTERS HERE, DESIRE YOUR OPINION ON PROBABLE REASON WE HAVE HAD NO DOG FOX POSITIONS IN VIEW OF AT LEAST ONE KNOWN TRANSMISSION FROM THIS SUBMARINE TO DELIVER MESSAGE TIMED 300048 AND EARLIER TRANSMISSION FROM SUBMARINE I-53 (MESSAGE TIME 292100) X ARE SUMBARINES USING UNKNOWN FREQUENCIES WHICH PREVIEEE PREVENT INTERCEPTION OF ORIGINAL TRANSMISSIONS QQ XX ALSO DESIRE THAT WE BE INFORMED OF ANY OTHER KNOWN TRANSMISSION FROM I-58 SINCE ARRIVING IN PATROL SECTOR X WILL APPRECIATE PROMPT REPLY XX

TOD 022326, INT ROGER KK
R       RMM [END P. 248]

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SRMD-005

UNITED STATES NAVY
FILE OF SIGTOT MESSAGES FROM
JICPOA ESTIMATES SECTION TO
CINCPAC ADVANCED HEADQUARTERS

BE V RE

CIC NR 321   

3 AUGUST 1945

FROM: CAPT DYER

TO: CAPT LAYTON

HARPER NOT PRESENTLY AVAILABLE X CANNOT STATE POSITIVELY BUT CONSIDER RPT CONSIDER LIKELY I-58 AND I-53 TRANSMISSIONS ON OTHER THAN REGULAR SUB FREQUENCY AS IT WAS NOT PICKED UP BY SUB SEARCH WATCH AT EITHER ABLE OR HYPO X MESSAGE WAS COPIED ON EMPIRE BROADCAST X REGULAR SEARCH WATCH OCCASIONALLY PICKS UP ON SUBS ON OTHER FREQUENCIES BUT CHANCES ARE SLIM OF PICKING UP ANY SPECIAL FREQUENCY USED FOR OCCASIONAL RPT OCCASIONAL SHORT TRANSMISSION UNLESS WE HAVE INFORMATION FROM DECRYPT X NO ADDITIONAL I-58 MESSAGES OR TRANSMISSIONS CAN BE FOUND.

TOD, 300437, WAJ AC PLS

R JDS [END P.418]

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