Inside a deep rock cave called The Black Pot (freely translated) on Bornholm. It was totally dark, so I took this picture to illuminate it and see what it looked like. I thought I pointed the camera towards one of my friends, but obviously my sense of direction failed so I took the shot mostly into the wall and couldn't see a thing. At least I did better than Erik who took two pictures without flash (there were no batteries in it as he discovered much later).