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Dangers in confined Spaces such as
Presence of toxic gases
Limited Oxygen Level
Entrapment
Engulfment
The dangers of confiend spaces are:
Reduced oxygen level
Fire
Flooding
Drowning,
Loss of consciousness from gas, fumes, vapour or lack of oxygen.
I assume the most important hazard would be reduced oxygen levels and possibly risk of fire. Asphyxiation is a risk as well and can be triggered even by an innocent factor such as dust.