the $395 million required for the bus tunnel project, assuming re-authorization of a mass transit grant program by Congress, while also extending the deadline for a final decision to September 1987. Hours later, the Metro Council awarded the first construction contract for utility relocation, with construction set to begin in July. The Metro Council accepted the UMTA contract during their June 5 meeting, allowing for bidding on tunnel construction to begin. The tunnel construction contract was awarded to the joint venture of Guy F. Atkinson Construction and Dillingham Construction in late September for $44.16 million, beating seven competing bids with an estimate far lower than the approximately $61 million predicted by Metro engineers. The contract for the dual-mode trolleybuses was awarded by the Metro Council to Breda Costruzioni Ferroviarie in October, consisting of an order for 236 buses at a cost of $133 million (equivalent to $ million in dollars); it was approved by UMTA in November. Construction Construction on the bus tunnel project began with partial closures of 3rd Avenue in July 1986 for utility relocation, narrowing traffic to one lane in either direction and restricting traffic to buses and emergency vehicles during rush hour. To prepare for extended periods of service disruption on 3rd Avenue, Metro Transit also moved its electric trolleybus routes onto 1st Avenue. Excavation of the 3rd Avenue tunnel segment began with the ceremonial launch of the "Mighty Mole", a , tunnel boring machine (TBM), on March 6, 1987. The TBM, designed by Robbins Company of Kent, Washington, and built by Nicholson Manufacturing in Seattle, began digging the western tunnel from Union Station the following May. A second, identical "Mighty Mole" TBM began digging the parallel eastern tunnel on June 29. During tunnel boring under 3rd Avenue between Spring Street and Madison Street on October 21, a small earthflow damaged a water main and caused pavement on 3rd Avenue to drop , shutting down water in the nearby Seattle City Light and 1001 Fourth Avenue Plaza buildings. While repairing the broken water main, electricians working on damaged high-voltage cables caused a small power outage that affected eight downtown buildings on the night of October 28, but were able to restore power by the following morning. Work on the western tunnel was briefly interrupted in November, when the TBM hit an unexpectedly large pocket of loose sand under Madison Street that had to be stabilized with