Water channel of poros blocks. Another view (from south) of same stretch along edge of the Fountain House. At the top can be seen the continuation at 27/IB ... AMS Horizontal (normal)
Water channel of poros blocks. View from west. 1 is the channel (poros blocks) running along the edge under strip of ancient earth at 27/IZ. 2 is bedrock ... AMS Horizontal (normal)