Sailors are trained to… fall down into water from a height of 10-20 meters. Their “flight” is performed while they are in the boat. Such trainings were used to be organized once a year, but now sailors “fly” every three months. Falling down trainings should help people to survive on a steamer or ship in case of a real tragedy. I can imagine how brave and courageous you have to be to become a sailor. I feel that I won’t be able to fall down in a boat on purpose!