https://declassified.library.utoronto.ca/files/original/31bd096dfbfb18001cf41574efdda770.pdf caeeb020dcbc02e0737ed0bb57c34fc0 PDF Text Text .ne'' SECRET FY FOREIGN OFFICE MAR 11/65 SECRET TO EXTERNAL OTTAWA 4 ROUTINE TWO ONE 07 F.EASE FASS FOLLOWING TC CANFORCEHFD FOR ^IRFCTOR OF COMM. FLANS. EEGINSO CSYH114 /3 /G. FOLLOWING FROM ROUTLECGE YOUR TEL NO XOCP 351 r S A O. OF 26 FFPRUARY. GIVEN THE AVAILAFILITY OF THE HYDRA Hr RADIO CIRCUIT WHEN CIRCUIT 11922 IN TAT ONE WAS OUT OF ACTION WF SHOULD EXPECT LTC AND OTC TO LIAISE VIA HYDRA TO FF AND FOR TRIPARTITE ALERTS :MESSAGES TRANSMITTED VIA THIS CIRCUIT. 2. IF THE HYDRA HF RArIO CIRCUIT AND THE CAPLF CIRCUIT IN TAT ON WERE OUT OF ACTION SIMULTANEOUSLY THEN WF ACRFF THAT TELEX SHOULD FE USED TO ENAPLE LTC AND OTC TO TALK TO EACH OTHER THE TRANSMISSION OF SERVICE MESSAGES PtTWE FOR AT N AND. THE DSO LTC ANC THE HEAD OF SHIFT ON THE COMPINFD FO /CRO SIGNAL OFFICE. 3 THE MINISTRY OF DEFENCE, LONDON /PRITISH EMPASSY WASHINGTON CAPLE CIRCUIT IN TAT ONE PROVIDES THE PRIME MINISTER TO PRESIDENT MA- CONFERENCE FACILITY. 00 n2 SECRET �SECRET FACE TWO AND FINAL 4 THE FACILITY IS AVIL.APLF CN FEMAND EY SWITCHING THE CIRCUIT FROM THE MINISTRY OF DEFENCE TO THE FRIMF MINISTER ° S OFFICE AT THIS END AND FROM THE PRITISH FMPASSY TO THE WHITE HOUSE IN WASHINGTON, AND A IN THE EVENT OF THE LOSS OF THIS CIRCUIT, CONSEQUENT NEED FOR LTC AND OTC TO TALK TO FACH OTHFR EY TELEX TO ARRANGE AN ALTERNATIVE ROUTING, IT SHOULD PF FOSSIPLF TO DO SO WITHOUT EXPLICIT REFERENCE TO THE "PRIME MINISTER /PRESIDENT" LINK. TELEX COULD NOT ITSELF PF USED FOR FRIME MINISTER /PRESIDENT TELECONFERENCES. 4. WE AN AGREE ALSO THAT IF LTC OR OTC WARNED THE OTHER PY TELEX OF IMPENDING ALERTS MESSAGE, THIS MESSAGE COULD PE TRANSMITTED EY TELEX. GPO CONFIRM THAT TELEX FROM 5. IN LON'T`ON HAS ALTERNATIVE ROUTES THE EVENT OF PREAKDOWN. ENDS. 1223 MAR 65 SECRET � Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Hydra Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context HY00388 Title A name given to the resource [Transatlantic Telegraph Cable Channels Under Breakdown Conditions] Date A point or period of time associated with an event in the lifecycle of the resource 03/11/1965 Source A related resource from which the described resource is derived Hydra Communications - Policy, RG24, 1250-36 Vol. 3, Library and Archives Canada (LAC) Creator An entity primarily responsible for making the resource Department of National Defence Rights Information about rights held in and over the resource Canadian Crown Subject The topic of the resource LTC, OTC, transatlantic cables, White House, 10 Downing Street, emergency planning, emergency communications, tripartite alerts Description An account of the resource Duplicate material in <a href="https://declassified.library.utoronto.ca/items/show/10695" target="_blank" rel="noopener">HY00387</a>. Marginal notation "Annex F." Publisher An entity responsible for making the resource available Canada Declassified Type The nature or genre of the resource Text Format The file format, physical medium, or dimensions of the resource PDF Language A language of the resource en