Apologies if this point has already been covered but do commercial pilots undergo training to experience the effects of depressurisation and hypoxia? I see from my logbook that in a seven year flying period in the RAF I underwent depressurisation training on four occasions, two by means of a simulated explosive decompression (quite dramatic) and two from the more insidious form of slow loss of oxygen. One thing that struck me was how quickly you recovered when oxygen was restored. I appreciate that loss of pressurisation drills are carried out in the Flight Sim, etc, but these dont give you the experience of what happens to your body in the event a real depressurisation