Buried: Knights Templar and the Holy Grail S01E01 - Holy City, Holy Grail

A new investigation into the true fate of the Knights Templar is launched to see if the order really fell in 1307 or if they continued on in secret. The team begins their probe in Jerusalem, the epicenter of the Templar's power, where they explore tunnels and a safe house that could have been used to get sacred holy relics to safety during the fall of the city.