A team of explorers discover a forbidding cave system riddled with ancient markings that seem to contain a mysterious meaning; using advanced photogrammetry, experts finally decode these cryptic scrawls to expose a dark chapter of English history.

A gruesome archaeological discovery leads to a shocking excavation that uncovers ancient human carnage on a scale that's unparalleled; experts use 3-D bone modeling to reveal evidence of what may be the first catastrophic, major war in human history.