I had an opportunity to explore the Great Salt Petre Cave this year with fellow photographer Robert Coomer and a few of his caving friends. It took a couple of practice shots to get everything set just right.Once we turned out the flash lights it was completely dark, the only light was the models head lamp. With the camera set to bulb I opened the shutter via remote release of approx 3 seconds before the assistant who was directly behind the model fired the flash.