The title says it all really, more an ancient UFO crash. If believed that aliens have been visiting this planet almost since time began then maybe the ancient aspect is not so far off the truth, but then UFO does not always imply alien craft, we do not know what our own civilisation is capable of beyond the technology we are spoon-fed in measures as opposed to the ultimate advancements that may have been garnered from possible alien encounters and covered up countless times through history. We only know what we are told and what we choose to believe is down to one's own choice and personal experiences.