CHERNOBYL - JANUARY 31: Highly radiated helicopters used to dump concrete and water on the reactor 4 during the 1986 catastrophe lay in a field near the village of Rosoha on January 31, 2006 in Chernobyl, Ukraine. From  April 27 to May 5, more than 30 military helicopters flew over the burning reactor. They failed to put out the fire with 2400 tonnes of lead and 1800 tonnes of sand. Tanks, helicopters, and all terrain vehicles from the Soviet Union's Red Army were left in this dump due to their high levels of radiation. (Photo by Daniel Berehulak/Getty Images)