St Helena Tunnel near Ewingsdale, Northern Rivers Region NSW, part of the Tintenbar to Ewingsdale Upgrade of the Pacific Highway completed by LendLease Construction for Roads and Maritime Services in 2015. The engineers are Hyder Consulting, now Arcadis. The project urban design was led in the tender stage by Colin Polwarth as an Associate Director of Conybeare Morrison Urban Design and later as Administrated during construction by Studio Colin Polwarth PL until December 2012. Colin Polwarth conceptualised the tunnel interior painting. Photograph courtesy RMS.