I set up a caving trip last night down Meeks entrance in Wigpool iron mine, specifically to take pictures as it's very pretty down there. It's about ten years since I've been there and I was really looking forward to it. We wriggled into the rather tight entrance and got to a point where I could take some snaps of the people following me. Unpack the camera and found that I'd forgotten to put the SD card back in after unloading the last lot of photos.