Churchill Barriers
four causeways in Orkney, Scotland
The Churchill Barriers are four causeways in the Orkney islands with a total length of 2.3 kilometres (1.4 mi). They link the Orkney Mainland in the north to the island of South Ronaldsay via Burray and the two smaller islands of Lamb Holm and Glimps Holm.
The barriers were built between May 1940 and September 1944, primarily as naval defences to protect the anchorage at Scapa Flow, but since 12 May 1945 they serve as road links between the islands. The two southern barriers, Glimps Holm to Burray and Burray to South Ronaldsay, are Category A listed.
History
On 14 October 1939, the Royal Navy battleship HMS Royal Oak was sunk at her moorings within the natural harbour of Scapa Flow, by the German submarine U-47 under the command of Günther Prien. U-47 had entered Scapa Flow through Holm Sound, one of several eastern entrances to Scapa Flow.
The eastern passages were protected by measures including sunken block ships, booms and anti-submarine nets, but U-47 entered at night at high tide by navigating between the block ships.
To prevent further attacks, First Lord of the Admiralty Winston Churchill ordered the construction of permanent barriers. Work began in May 1940 and the barriers were completed in September 1944 but were not officially opened until 12 May 1945, four days after Victory in Europe Day.
Construction
The contract for building the barriers was awarded to Balfour Beatty, although part of the southernmost barrier (between Burray and South Ronaldsay) was sub-contracted to William Tawse & Co.
“Churchill Barriers” enters the record as four causeways in Orkney, Scotland. Crown Archives preserves that source wording while asking what Churchill, Barriers and four can confirm, complicate or overturn.
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Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated Jun 24, 2026. The linked authority identifier is Q1089879. Authority coordinates are 58.893, -2.897. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1940, 1944, 1945 and 1939.
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This entry incorporates text from “Churchill Barriers” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.