Figure 1
From: Cloud-fracture networks as a means of accessing superhot geothermal energy

The first-ever hydrofracturing experiments at supercritical temperatures in a true triaxial stress state. (a) A cubic granite sample with a vertical borehole. (b) The newly-designed true triaxial cell using a plastic melt as a sealing agent. (c) The complete experimental system including the true triaxial cell.