Question #174:

What would you do if there was a sudden cabin depressurization? Paraphrase: Imagine there is a quick loss of cabin pressure. What will you do in this case?

Answer:

In the event of loss of cabin pressure, it is essential that the flight crew use oxygen equipment as soon as possible. Also Emergency Descent is initiated. In the case of an uncontrolled depressurisation, the crew will descend immediately to an altitude at which they and the passengers can breathe without oxygen masks.