ByrneLooby prepared the detailed design of the specialist geotechnical elements to facilitate the construction of the underpass. A secant pile wall was installed along each side of the excavation. We devised a grouting strategy to control groundwater ingress into the excavation. The quality and validation proposals prepared by ByrneLooby were designed to allow the contractor to quickly gain confidence in the grouting solution as the works proceeded. The solution developed by ByrneLooby has provided a template for future deep excavations in the Cork city centre area.