Laos is famouse for being the most bombed nation on earth. Between 1965-1973, the USA conducted one of the largest sustained aerial bombardments in history, flying 580.344 missions over Laos and dropping two million tons of bombs, costing US$2,2 million a day. Around 30 percent of the bombs dropped on Laos failed to detonate, leaving the country littered with unexploded ordanance (UXO). The clearance work is slow and very expensive. At the current rate of clearance it will take more than 100 years to make the country safe.