Using U.S. Congress and British Home Office official data, this programme shows what would actually happen if a one megaton warhead burst a mile above St Paul’s cathedral in the centre of London. Within 30 seconds houses six miles away would be reduced to rubble, winds of 80 – 90 miles per hour would toss objects pell-mell, and shatter windows, sending shards of glass through the air at 120 feet per second, slicing skin. Paper and other light material would ignite spontaneously. Those in sight of the light would suffer severe third degree burns, charring skin to black carbon and causing permanent retinal burns. Two couples carried out civil defence measures to see how effective these measures would be. For ten days they lived in temporary constructions following government guidelines. The film looks at how they fared, but suggests that after an actual explosion it is highly unlikely they would emerge at all.
The Hiroshima Bomb had a strength of 15 Kilotons.
A single rocket fired from a Trident submarine carries three nuclear bombs with a total strength stated to be the equivalent of a 1 Megaton bomb.
1000 Kilotons = 1 Megaton
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