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The process of foundation works such as diaphragm walls or panels is sometimes penalised by the presence of very hard soil in the anchoring layer. Today, the Hydrofraise allows reasonable drilling rates for soils with compressive strength up to 100 MPa. The Versatile Fraise will be a new tool to extend this limit up to 200 MPa. The study begins with the analysis of the rock crushing phenomenon under carbide bits, is followed by the interaction of a group of bits, then by small scale tests with a roller. Scale 1 tests follow up using the definitive geometry of the drums on full size granite blocks. The definitive device still needs some engineering, but will soon be fully operational.