In the village of Fouvent-le-Bas (Haute-Saône, France), two emblematic caves were occupied by both humans and fauna during cold conditions of the Late Pleistocene. Both are located at the edge of the village on the right bank of the Vannon river. The oldest cave is "l'abri Cuvier 1" (excavation of 1825 to 1886), a world-famous archeo-palaeontological site yielding faunal bone remains. Baron Georges Cuvier used as index fossils to recognize the Woolly Mammoth (Cuvier, 1812) and to differenciate the ancient cave hyena from the extant spotted one (Cuvier, 1812, 1825). 165 years later, 20 meters away, along the same limestone escarpment, a long gallery 12 meters long and named « Cuvier 2 » was discovered yielding bone material similar to that found at “Abri Cuvier 1 ». From 1989 to 1992, field work (dir. D. Morin, J. Detrey, G. Huguenin) generated abundant bones remains consisting in typical steppe-tundra mammals (mammoth, rhino, horse) and carnivores (hyena and lion cave). In addition, the lithic industry reveals cores, flakes and tools which belong to the Mousterian but also in the highest levels in the upper Palaeolithic, some projectiles such as Gravette and microgravette points. In 2021, 30 years later, we reopened « Cuvier 2 » gallery and its diverticula (Lamotte (dir.), 2021) in order to cross-reference all the data inherent in this karstic complex from « Cuvier 1 » and « Cuvier 2 » that offered shelter to fauna and human communities during the Late Pleistocene. The use of drones with 5 bands multispectral view and other new technology like photo-grammetry have been key additions to this most recent episode of fieldwork. They have allowed new data to be generated from these ancient caves.