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I was on Arvia this year K306 and noticed that during the afternoon on the sea days strange things happend to the air condition in the cabin. The warm air stopped and cold air containing some unidentified gas came out for a period of approximately 20 mins-What was going on ? Later that day in the corridor a man with a gas bottle and applicator was going the full length of the ship squirting the same unidentified gas.... I am happy to say I am still alive and well question is what was going on...