the first thing you do. this is called a cabin altitude issue. that means a decompression scenario. and bear in mine the environment that this might mean for the pilots. you have a sudden pop, explosion, whatever you might say. things are flying. you might have loss of lighting or power. you might lose your primary flight display. the screen you use to fly. you might be using little gauges. it is a very chaotic environment. and they say that flying is long hours of boredom punctuated by moments of stark terror. this is a stark terror moment. so obviously the oxygen masks go on first. that's number one. they drill it. you should be able to do in it two seconds. remember i was telling but the context. this is incredibly loud now. the most important thing. forget air traffic control, forget the back of the airplane,