Japanese high school students have created a virtual reality program to mark the 73rd anniversary of the atomic bombing of Hiroshima. The American bombing on August 6, 1945, along with the bombing of Nagasaki three days later, ended World War II. The first attack killed an estimated 140,000 people. The students produced a five-minute program that recreates the sights and sounds of Hiroshima before, during and after the bombing. Their project took two years to complete. The students and their teachers undertook the effort in hopes that such an event will never happen again. In order to experience the program, users wear virtual reality headsets. The program lets them take a virtual walk along the Motoyasu River before the bombing. It shows the buildings and businesses that once stood. Users also can enter a post office and the Shima Hospital courtyard. The bomb exploded directly above the hospital, completely destroying it. They can see the remains of a building now called the Atomic Bomb Dome.