Intelligence & CSDIC

Building on Helen Fry's important research into the role of Combined Services Detailed Interrogation Centre (CSDIC) in WW2, I have been looking at the contribution of Naval Intelligence Division (NID).

ADM 1/16833: FOREIGN NAVAL VESSELS - DAMAGE AND LOSS (30): Interrogation of survivors from the German battleship SCHARNHORST
National Archives record ADM 1/16833: NID preliminary report on the interrogation of Scharnhorst survivors (transcription)
ADM 1-16833 Scharnhorst prelim report re[...]
Adobe Acrobat document [276.2 KB]
ADM 223/88: Admiralty use of special intelligence in naval operations (extract)
An extract from National Archives record ADM 223/88 covering the role of special intelligence (Ultra decrypts) in the sinking of Scharnhorst.
ADM 22-088 Special Intelligence - Scharn[...]
Adobe Acrobat document [242.2 KB]
ADM 223/472 Extract: Memo from Ian Fleming about OVERLORD
This proposal for a more assertive NID involvement in D-Day planning seems to have been largely slapped down. However, paragraph 5 (v) to (ix) look very much like the eventual brief to the naval parties that took over German ports after the surrender.
ADM 223-472 Extract Fleming-Overlord.pdf
Adobe Acrobat document [164.5 KB]
ADM 186/809 Extract: Transcript of SS Alsterufer Interrogation Report
SS Alsterufer was a blockade-runner lost in the Bay of Biscay in December 1943. Most of her mixed merchant and naval crew survived, and spent time at a British interrogation centre on their way to internment in Canada. This is the result.
The invaluable U-Boat.net website has a lot of interrogation reports of submarine survivors, those from surface ships are trickier to find. I hope this redresses the balance a little.
NOTE: If you need a trigger warning, consider it given. This document embodies 1940s language and attitudes!
ADM 186-809 Alsterufer.pdf
Adobe Acrobat document [1.1 MB]
ADM 223/475 Extract: Transcript of a post-war paper on prisoner interrogation by Lt Cdr Colin McFadyean
The paper is heavily marked up, in some cases apparently by Churchill himself. I have used strikeout and curly brackets to indicate the edits where I can, but in some places struggle with the handwriting.
Although the paper unsigned there are enough cross-references elsewhere in the file to leave no doubt as to the authorship.
ADM 223-475 PW Interrogation 1939-45 tra[...]
Adobe Acrobat document [914.9 KB]
WO 208/3256: Mediterranean and Middle East theatres: use of 'X' source (concealed microphones) in interrogation centres run by CSDIC 1940-1945
This long document describes the use of concealed microphones in British army interrogation centres in the Mediterranean theatre. It is particularly interesting for their pioneering work on binaural (stereo) reception and the use of mobile units. I did consider including it as an appendix to 'Castaways' but its size would have made the book significantly longer and more expensive.
WO 208-3256 X-Source in ME.pdf
Adobe Acrobat document [1.7 MB]
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© Derek Nudd - Author