The human being requires an atmosphere of 20.8 per cent oxygen and 78 per cent nitrogen for well being. Any space that has less than 20.8 per cent oxygen is dangerous and will be eventually fatal to human.
Last week a number of fatal death's were reported due to entry to enclosed space ashore. In UK , realising the severe dangers of enclosed spaces the Health and Safety Executive passed the Cofined Spaces Act in 1997.
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