A tunnel with a rectangular cross$-$section has been excavated horizontally in a north easterly direction at a width of $5$m and height of $3$m and on a bearing of $68\backslash$deg to true North. A joint is visible at floor level in the North Western wall of the tunnel $6$m back from the face of the tunnel. The joint reaches the roof of the tunnel at $2\mathrm{.}9$m from the face of the tunnel. It is also visible in the roof and intersects the face $3\mathrm{.}3$m from the north western wall.