NAT for Portland, OregonNorth American Tunneling (NAT), the top underground construction show of the year for the Americas, takes place in Portland's Marriott Downtown Waterfront Hotel from June 20th to June 23rd, 2010. Short course workshops are scheduled for Sunday, 20th June with the main theme, Tunneling: Sustainable Infrastructure, commencing on Monday morning with a talk by Portland mayor Sam Adams followed by a full programme of papers. Over 100 companies are exhibiting during the conference, signalling the ongoing good health of the tunnelling industry. For more about the NAT conference, click on the NAT banner. 18/10.