I was walking the Cornish coastal path past some cliffs and saw a side path that the map showed led to a cave. It was really a narrow ledge, cut in the cliff side. I walked along it, stepping over a gap and spent a bit of time looking at the cave.

Heading back to the main path, I had the sudden realisation that the gap I’d stepped over earlier was where a section of the ledge had broken off. Which meant that the bit I was standing on was also at risk of breaking off. I don’t think I’ve ever experienced fear like it. I got a shot of adrenaline that left me shaking. The sea was a long way down, big waves pounding jagged rocks. I had to hug the cliff and wait for my heart rate to settle before I could step over the gap again.