Research into anti-coagulants to stop blood clotting is described, resulting in the use of sodium citrate. Researchers are seen working on this in laboratories. The use of blood transfusion in WWI is described, and the apparatus is shown. A re-enactment of a phone call from Kings College Hospital to the British Red Cross asking for blood is shown to explain the setting up of a civilian blood transfusion programme in 1921. This led to a scheme being set up, with similar schemes following nationwide and worldwide. This is shown using animations. Next, research into blood storage is described with a Russian accented voiceover. Researchers in Moscow particularly researched this area, Russia being such a large country and needing adequate storage of blood supplies, and their work is shown. An American voiceover describes the blood bank system in the United States, with accompanying animated footage. A Spanish-accented voiceover describes the Spanish system, and how it was used in wartime. A refrigerated lorry is shown delivering blood to the front line.