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A stowaway is a person who secretly boards a vehicle, such as an aircraft, bus, ship, cargo truck or train, to travel without paying and without being detected. == Air travel == Poor perimeter security at a number of airports around the world can make it easier for people to stow away on planes. Stowaways in aircraft wheel wells face numerous health risks, many of which are fatal: being mangled when the undercarriage retracts, tinnitus, deafness, hypothermia, hypoxia, frostbite, acidosis and finally falling when the doors of the compartment reopen.〔 The landing gear compartment is not equipped with heating, pressure or oxygen, which are vital for survival at a high altitude.〔 According to experts, at , hypoxia causes lightheadedness, weakness, vision impairment and tremors. By the oxygen level of the blood drops and the person will struggle to stay conscious. Above their lungs would need artificial pressure to operate normally.〔 The temperature could drop as low as which causes severe hypothermia.〔 Those stowaways who managed to not be crushed by the retracting undercarriage or killed by the deadly conditions would most likely be unconscious when the compartment door re-opens during the approach and fall several thousand feet to their deaths.〔 David Learmount, an aviation expert of Flight International, told ''BBC'' about a lot of ignorance in this area. He suggested that no one would be willing to risk such journey, having full understanding of this kind of ordeal.〔 Stowaways who survived usually traveled relatively short distances or at a low altitude.〔 Two cases are known of people who survived at an altitude of about – a man on an 8-hour flight, whose body core temperature fell to , and a 16-year-old boy who was unharmed by a 5.5 hour flight, despite losing consciousness. Almost all aircraft stowaways are male.〔 In one reported case, in 2003, a young man mailed himself in a large box and had it shipped on UPS planes from New York City to Texas. He survived because the box travelled in a pressurized hold of an aircraft. From 1947 until September 2012, there were 96 known stowaway attempts worldwide in wheel wells of 85 separate flights, which resulted in 73 deaths with only 23 survivors.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Stowaway」の詳細全文を読む スポンサード リンク
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