By now our route was clear and becoming ever more interesting.

We had to walk across the crumbling, rusting remains of the top of the water tank to take some brick built steps to the base of the vertical iron ladder. And the brick built steps were no wider than two bricks. Additionally this was all made more difficult by the huge girder just above us.

The concept of a floor, or level, was also becoming vague. Especially when dealing with two bricks in the side of a wall.