carefully unearthed from the site they're taken to the museum of london archeology labs where the signist at thiseses there further study and catalog them and learn all sorts of things about history. each skeleton goes through the processing protocol. after pressure washing, they're put in a drying room for a few days and then cataloged. because the site cemetery yielded so many skeletons, more than 3,000, there are plenty of samples to look at to figure out how somebody lived and died in 1569. >> i want to see if they can identify people who maybe died from the plague and look at the path general itself from the teeth of these individuals and hopefully find out more about you infection diseases evolve. visitors are welcome. >> being in london you don't get to appreciate the history around you and it's right here. >>reporter: under the roman clay lies prehistoric gravel. there are not be human remain there is. that's when they make way for an even bigger dig. to build a rail way ticketing hub creating another layer of london history. >>> get more on that and all the global stories if you