Hadesarchaea are the only archaea that can turn carbon monoxide and water into carbon dioxide and oxygen. When they do this, the reaction gives off hydrogen. Scientists looked at more information about the Hadesarchaea genome and believe they have genes that let them put carbon atoms into other molecules and make methane. Other scientists think Hadesarchaea may be able to use sugar and amino acids as fuel and change nitrite into ammonium. Scientists think Hadesarchaea help in geochemical processes.