On this diagram, subducting Slab ( geology ) | slabs are in blue, and continental margins and a few plate boundaries are in red.

The Cabinet War Rooms office-bedroom of Brendan Bracken, Churchill's Ministry of Information ( United Kingdom ) | Minister of Information. On 22 October 1940, during the Blitz bombing campaign against Britain, it was decided to increase the protection of the Cabinet War Rooms by the installation of a massive layer of concrete known as ' the Slab '.