A、Close the hatch, accesses and ventilators at once. Flood CO<sub>2</sub> into hold.
B、Open the hatch, accesses and ventilators at once. Flood CO<sub>2</sub> into hold.
C、Close the hatch, accesses and ventilators at once. Flood water into hold.
D、Open the hatch, accesses and ventilators at once. Flood water into hold.
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