Do you pay attention to your air stewards during the safety demonstration before take-off? Or do you bury your head in your newspaper thinking "it won't happen to me!" Be honest now!
The people in this video have decided to take the demonstration seriously by taking a class how to survive an aircrash if it happens over the sea.
David Learmount reported that global figures for commercial aviation crashes in 2007 are at an all-time low, which is obviously good news, but nevertheless it is important to be aware of how to get yourself out of a sticky situation.
The video shows people getting into an aircraft simulator, the "Dunker", in a swimming pool and surviving underwater. They each get a certificate in crash survival for "peace of mind" in the knowledge that they have prepared themselves and know how to live through a crash by putting into practice using the life jacket and getting onto the raft.
It takes about 30s to escape from the Dunker. I wouldn't like to try it - I have a fear of being under water after a kayaking lesson where I tried and tried to learn, unsuccessfully, to perform an eskimo roll.
Perhaps one day I will be forced to face my fears...