Today we proceeded with the 1 m extension along the E semi-perimeter of T46. This extension clarified that Wall 1 is built against bedrock. However, while it seems to continue towards NW, no additional portions of the wall have been detected in the SE portion of the extension. In addition, in this area there seems to be a layer of dark brown matrix beneath bedrock. Further extensions may be performed to clarify the, still, unclear situation.