Question #1

A software company in Nigeria develop a software for a large steam evaporator of magnesium chloride service, the evaporator contain internal heating tubes and it was to be cleaned. It was shut down, drained and washed. The next day, two employees who were requested to clean and repair the evaporator entered the vessel to repair the tubes. The were both overcome, suddenly with the lack of oxygen. One of the employee recovered and escaped, but the other never regained consciousness, and died several days later.
What is your opinion for the death of the other employee ?

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