On the left is the view east across the covered shaft and showing the end of the Horse Whim wall. On the right is the view south towards Hebden.
To take shelter, the walker has to pass around the end of the wall and thus is unknowingly passing within a yard of the shaft. On the south and west side of the shaft, within 2 feet, there is a drop off as natural ground level is about two yards below shaft level. As the exploratory shaft was being dug, the miner’s often just dumped the rock at the top of the shaft, rather than taking it away, so the top of the shaft went up as the miner’s dug down.