Who has been digging holes?

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Out for a walk yesterday with Izzy my dog, we were looking for the local Kirdford Geocache, and we came across and area of the woodland (behind the football pitch) where the ferns had been brushed down and three ‘pits’ had been dug. I am not sure when they were dug, but they were quite full of water, so not recent.

I was wondering if anyone knows why they were dug and possibly why they have not been filled in again, they would probably make a good man trap if you were walking through the woods in the dark.