It was one of the most significant and complex civil engineering achievements of the 20th century, closing off four fast-flowing tidal channels to form causeways that sealed off the eastern side of the anchorage of Scapa Flow and link today the island communities of Burray and South Ronaldsay with the Orkney mainland. The challenge was taken on by the construction company Balfour Beatty. Civil engineer John Andrew tells the story of how they solved it, and the massive scale of the operation with its quarries and rockworks, cableways and railways.
In association with AOP
You can watch this free event from here, or if you’d like to join questions and discussion, you can also go direct to it in the Science Festival’s YouTube channel