UNICEF estimates that there may be as many as 100,000 street children in Ukraine. Marcel Theroux and Suemay Oram go underground in Kiev to meet some and find out what their life is like. Ukraine has invested billions in infrastructure projects for the 2012 European football championships. While the fans will enjoy the facilities, most of them won't know that living around them - and beneath their feet under the country's cities - are thousands of young people left on their own to survive dangerous, subterranean lives. Since the break-up of the Soviet Union, years of economic hardship have hurt Ukraine. The result has been a lost generation of teenagers who have run away from broken families, alcoholism and abuse. They suffer awful living conditions and embarrass the Ukrainian government, which in June will host the European Championships as part of its efforts to project a modern, European image with luxury shops and a thriving culture. Many of the teenagers inject drugs or sell sex, and face serious health risks including syphilis, hepatitis, and HIV/AIDS. In some cities, close to 20 per cent of youngsters living on the streets who were tested were HIV positive. Theroux and Oram journey underground through pitch-black basements and passageways under the streets of Kiev. Their guides are a group young people who have made their home at the end of a warren of dark corridors. Outside, the temperature is below minus 20 degrees. Underneath the city's Soviet apartment buildings, hot water pipes are helping keep the street children alive. The team finds 13 who have set up home together, surrounded by mounds of rubbish, which indicate they've been living rough for some time. They've been sniffing glue to take away the feelings of cold and hunger, and the effects are starting to become obvious. Longer-term use causes brain damage. The leader of the group is Vanya, a 29-year-old ex-prisoner. He tells Theroux he can't work because he has no ident