For those that haven't worked out what it is they are saying, I can tell you that the most useful bit contained in their speech , when you are flying from Chile to Australia,  is about a life vest  under your seat. Knowing that, relax and take your time to leaf through the tax-free-goods-magazine. This you will find in a pocket at the back of the seat in front of you.  They will also tell you this but you won't understand  either. Make sure you check the life-vest is there because if it isn't and the plane is floating for a while on the ocean before going under, it maybe too late.