The Geneva Conventions require all states to prevent people from going missing and to search for those who do. Jose Serralvo, ICRC legal advisor, details these obligations. He is joined by Jérôme Cassou, data manager at the ICRC CTA Bureau for the international armed conflict between the Russian Federation and Ukraine, who talks about the practical ways the huge volume of information gathered by the ICRC is handled and processed to provide families with answers as quickly as possible.