Starting now. You can watch the Seattle City Council discuss the deep-bore tunnel here. Critics of the tunnel cost overruns are expected to testify before the council and, of course, so will tunnel supporters. The council will also hear from consultants and folks at the state—addressing engineering concerns—who are expected to say that everything will work out just fine.
UPDATE: Of the 18 people who provided comment, 16 of them were opposed to the current financing arrangement with the state. Almost all of them urged the council to take steps to indemnify the city taxpayers from paying for any overruns on the project and for the state to clarify who will pay.
UPDATE 2: Here's a slide that summarizes how the project risks can lead to cost overruns, but, don't worry, the state totally has it all taken care of: