The masks are there to survive sudden cabin decompression at high altitudes where the atmosphere is too thin to breath. There is only enough oxygen to last a fe

The masks are there to survive sudden cabin decompression at high altitudes where the atmosphere is too thin to breath. There is only enough oxygen to last a few minutes. Further reading: https://www.telegraph.co.uk/travel/travel-truths/truth-about-oxygen-masks-on-planes/ https://www.telegraph.co.uk/travel/travel-truths/truth-about...