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Open blast shelters were built on technical sites such as 70MU in preference to air raid shelters. Their 5 1/2 feet high and 14 inches thick brick walls and earth banks provided quick and safe protection to crouching airmen from the blast effects of enemy bombs but offered no protection from a direct hit.

These buildings were designed to have a life span of 10 years and were built of single brick, without a cavity wall, with piers at ten feet intervals. The walls supported a light steel frame carrying asbestos sheeting or board and felt roofing. Outside the brickwork was rendered with cement whilst inside the walls were painted a variety of colours. The buildings had concrete floors.

A blast shelter and temporary/half brick search room. Drawing © Mike Millichamp.