In the heart of the karstic massif of Fontaine-de-Vaucluse, LSBB enables research to be undertaken at scales that are usually unobtainable, ranging from flowing fractures (61 currently) to a continuum of 14,000 m2 (beneath 30 to 519 m of cover rocks), with everything in between, in particular one block 5 m on a side and 20 m high (5 boreholes). It is thus possible to study problems of changing scales with a real ability for validation.