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I got on my hands and knees and began to crawl through the dark confined space. It was stiflingly claustrophobic and so low I had to remove my rucksack and push it before me, obscuring my view of what lay ahead. It made progress difficult.
It also gave me a revelation.
The reason for the extra wheels on Jim’s sack cart was to enable him to push it while it was lying flat on the ground with a body on it, just as I was pushing my rucksack.
I emerged from the tunnel onto a stone floor with headroom enough for me to stand. Before me, a spiral staircase descended into the darkness.
I took a deep breath, summoned up my courage, and descended the staircase.
At the bottom, I found myself in a long corridor with a vaulted stone ceiling. Other corridors connected to it at right angles, and
