About thirty five years I was tasked to fly an RAF station photographer over a Jaguar crash site for the benefit of the imminent Board of Inquiry (the crash had not long happened, I had just returned from flying the pilot to hospital). The Jag had gone vertically into a grass field from 10,500 feet with the engines running at high power. The impact crater was surprisingly small and compact, with only a tail pipe and one taileron showing above ground. The photographer quickly thought he'd got all he needed until we noticed an unexplained fresh swathe cut through an adjacent field of standing maize. He took photos of it, although we couldn't understand what it was at that time. The swathe turned out to be caused by an Aden cannon, which had curved upwards from the crater and tunneled itself out of the ground quite some distance away where it cartwheeled across the surface through the crop.