There is a great confusion about the fire in the CO2 room..... here's the answer:-

If there is a fire occuring in the co2 room, the temperature in the room rises. The temperature of the room keeps on rising, when the temperature of the room reaches to about 63 degree celcius the pressure inside the co2 cylinder will also increase to about 177bar. At this pressure the bursting disc will rupture spontaneously and the co2 will be realeased and as the master valve to the engine room is closed the relief arrangement on the manifold will release the co2 to the co2 space which will extinguish the fire in that room.