While the Highway 99 tunneling machine hasn’t made much news lately, it’s continuing to dig steadily along, says WSDOT. Their latest twice-weekly update, published this afternoon, says it’s more than two-thirds of the way down the route – 6,337 of 9,270 feet. It’s already gone past the deepest point on the route and is starting to climb back toward the surface, currently in the zone beneath Belltown. The current estimated opening date remains early 2019, and as noted in this tweet, Viaduct demolition would follow over much of the rest of that year.