Looking north. Tiles of 69 Drain, in front of them westernmost Wall of Pit system. Note marble chips between Wall and Tile Drain ... Scanned 2005 for the 75th anniversary exhibition and publication. north 6709 Horizontal (normal) ... 18 Oct 1947
Looking east, after removing 2 Tiles. Westernmost and Second (W and S) Walls of Pit system. Note marble chip fill under drain ... Scanned 2005 for the 75th anniversary exhibition and publication. east 6711 Horizontal (normal) ... 20 Oct 1947