Today in the early evening, COSC-2 passed 1500 m depth. After the change of drill bit at 1470 m drilling went smoothly and fast. We passed through an about 4 m thick metasomatised deformation zone and thought that we eventually will encounter a new rock formation. But we are still in the porphyry, probably another tectonic slice of it. Presently, the reason for the laterally extensive seismic reflector at 1450 m (± 5 %) is still a riddle. Either it is different from our imagination of how such a reflector "looks like" or it is deeper than we expected. Future downhole logging and/or further drilling will hopefully solve this mystery