[Reportage Photo] In 1760, Horace Bénédict de Saussure was 20. He describes red snow on the slopes of Mont Brévent (2525m) and observes small red cells under the microscope (Voyage dans les Alpes). Nearly 262 years later (June 2022), scientists from the AlpAlga consortium (A. Amato, J. Ezzedine, L. Gielly, E. Maréchal, LPCV and LECA) returned to this massif above Chamonix, facing Mont Blanc, to collect samples and carry out measurements and analyses. It is indeed Sanguina nivaloides. We now need to characterise the other microorganisms associated with this microalga, and to see whether this local Sanguina population is isolated or in contact with other Sanguina populations in the other Alpine mountains.