The Friends of Derry Walls have announced that an archaeological dig including community participation is underway to investigate the ditch of the city walls.
Niall McCaughan, Chair of The Friends of the Derry Walls stated: “We are delighted that the big dig that we had been hoping for many years is finally here. In 1977 Brian Lacey carried out a dig near the Alexander House site just outside of Bishop Street, and at that time he found the remnants of a ditch. Since then, the late Mark Lusby, Founder and Project Officer of The Friends of the Derry Walls wondered if in fact further evidence of a ditch around the Walls could be found and confirmed to be still in existence. In 2017 The Friends invited Queen’s University Archaeology down to do a short survey, and the grassy bank at Nailors Row was chosen as it was the largest open space around our famous historic Walls."
More details here and in this BBC article.