Crews opened a second temporary channel on Tuesday allowing a limited amount of marine traffic to bypass the wreckage of Baltimore's collapsed Francis Scott Key Bridge, which had blocked the vital port's main shipping channel since its destruction one week ago. Work is ongoing to open a third channel that will allow larger vessels to pass through the bottleneck, officials announced at a news conference Tuesday afternoon. The channels are primarily open primarily to vessels that are helping with the cleanup effort, along with some barges and tugs that have been stuck in the Port of Baltimore. A tugboat pushing a fuel barge was the first vessel to use an alternate channel late Monday. It was supplying jet fuel to Delaware's Dover Air Force Base. http://www.wbaltv.com/article/tempora...