The driller cores the rock with an NX-size core barrel. The engineer and geologist examine the rock core and determine the best locations to perform the tests. The field crew threads the rock pressuremeter hydraulic and electrical (LVTD) sensor cables through the wireline casing, which protects them. The driller lowers the rock pressuremeter probe that attaches to the wireline casing (conveniently used like rods to lower and remove the pressuremeter) to the bottom-most test depth (Figure 4) and the engineer performs either a stress-controlled or strain-controlled rock pressuremeter test. For stress-controlled tests, the engineer uses 1 MPa stress increments for fair-quality rock and 3 MPa stress increments for high-quality rock. For strain-controlled tests, the engineer uses either 30 cm3 volume increments for fair-quality rock or 10 cm3 volume increments for high-quality rock. Depending on the diameter of the diamond rock core shoe, the rock pressuremeter contacts the rock borehole sidewall at a volume between 130 and 180 cm3. After the engineer applies pressure to the rock, the field data logger records the pressure and volume after an elapsed time of usually 1 minute. When the test is completed, the engineer deflates the membrane and the driller raises the rock pressuremeter to the next test depth.