Undersea cable warfare, interception, and sabotage in WWI and WWII (1914–1945)

1. Britain prepares to target enemy cable links

   Jan 1, 1911Labels: British government, Undersea cables

   • Room 40

2. CS Alert cuts German Channel cables

   Aug 5, 1914Labels: CS Alert, English Channel

   • National Archives
   • CS Alert
   • Room 40

3. Germany raids Fanning Island cable station

   Sep 7, 1914Labels: Fanning Island, East Asia

   • Fanning Raid
   • Britannica
   • Naval Inst

4. Emden cuts Perth–Cocos cable at Direction Island

   Nov 10, 1914Labels: SMS Emden, Direction Island

   • AWM photo
   • NLA record
   • Emden

5. Room 40 expands cable-and-radio interception work

   Jan 1, 1915Labels: Room 40, British intelligence

   • Room 40
   • NSA Museum
   • TNA WWI

6. Zimmermann Telegram shows strategic value of cable access

   Jan 17, 1917Labels: Zimmermann Telegram, British interceptors

   • Zimmermann
   • NSA Museum
   • MI Museum

7. Interwar lessons drive emphasis on communications security

   Jan 1, 1920Labels: Interwar period, Communications security

   • Nexus HUP
   • TNA WWI
   • Room 40

8. Germany occupies Channel Islands and installs observation posts

   Jul 1, 1940Labels: Channel Islands, German occupation

   • Dryad
   • Casquets
   • IWM

9. Operation Dryad raids Casquets lighthouse radio post

   Sep 3, 1942Labels: Operation Dryad, Casquets lighthouse

   • Dryad
   • Casquets
   • IWM

10. Operation Musketoon sabotages Glomfjord power for industry

    Sep 11, 1942Labels: Operation Musketoon, Glomfjord

    • Musketoon
    • Musketoon site
    • IWM

11. SAS operations cut phone lines during coastal sabotage

    Oct 27, 1943Labels: SAS, Italian campaign

    • Candytuft
    • UK Nat Army
    • Imperial War

12. War ends with cables recognized as lasting strategic infrastructure

    Sep 2, 1945Labels: Postwar lessons, Undersea cables

    • Nexus HUP
    • Zimmermann
    • TNA WWI