There are many kinds. Concrete and steel were once used, and perhaps a layer of lead to give added protection from nuclear bomb radiation. Newer shelters incorporate synthetic materials not available in the 40's and 50's. Prefabricated bomb/tornado shelters are for sale, and plans are available to build your own if you want. Some are sophisticated with electricity and water, but a ventilation system is absolutely necessary for all of them so the survivors can breathe.
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In the 1960's bomb shelters were built in people's back yard and under houses. It was a very popular thing to do. We were all sure that at some point there would be a nuclear war between us and Russia. Cities designated subways and other places as bomb shelters. Had a nuclear war broken out all of us would have been cinders before we could get to a shelter.
There were various types of shelters during World War 2 in the UK. Individual people might have had a re-enforced concrete shelter if they could afford it. Others (Anderson Shelters), were made of corrugated iron and designed to be self built and placed half buried in back gardens. People who didn't have any outside space were issued with a Morrison Shelter, which was basically a steel cage to be built indoors.
They were small buildings that were made out of concrete and were empty unless you put furniture in them and they had no windows and they were very protective.
Most bomb shelters are built underground and of very thick cement or concrete. Some have led incorporated into the outer wall for radiation protection.
Air raid shelters are made of anything that i strong and can protect people from bombs.
Most residential air raid shelters were made from corrugated steel sheet and designed to be covered with a layer of earth or sod.
Hundreds of thousands of Londoners used the bomb shelters and survived the Blitz.
a bomb shelter
In the US, bomb shelters were a boom in business in the late 1950's and early 1960's; the Eisenhower/Kennedy years. They were hardly spoken of after the mid 1960's. By the late 1960's people often spoke fun of those people (made fun of them) that built those bomb shelters. ALthough no doubt some may still exist, bomb shelters in the US are a thing of the past which ended in the 1960's.
Bomb shelters are structures build of reinforced concrete. The outer walls are usually several meters thick, which makes them really hard to break (that lead to the development of a bunker buster bomb). In addition to that, most bomb shelters are under ground. The combination of all the three measures makes the probability of the personnel survival very high.
bomb shelters