Dr. A. Wayne Evans, MD, DRCPSC, has recently been consulting to West End Connectors, the company performing the tunnel boring (TBM) component if the Eglington Subway Extension in the GTA. The specific portion of this enormous engineering feat is known as a Hyperbaric Intervention (HI). Dr Evans and his organization have been engaged to manage the problems that could occur from work in the compressed air working environment. This is based on his extensive hyperbaric experience as well as his understanding of engineering …