This film depicts Vietnamese medical cadres working to save the lives of people in the liberated areas of South Vietnam during the war. At the front, medics carry the wounded to carefully concealed tunnels where intricate surgery is performed with the aid of generators powered by the pedaling of bicycle wheels. These resourceful and determined people set up medical research centers in the middle of jungles that were totally mobile in the event of U.S. bombing raids. [with English voiceover and subtitles]