Hundreds of passengers aboard the Blue Line were evacuated Tuesday afternoon after a train became stuck beneath the Boston Harbor, between the Maverick and Aquarium stations, officials said. Over the course of about an hour, Boston firefighters assisted with the evacuation of 500 people from the disabled train, the department said.

Boston firefighters evacuated 500 people aboard an MBTA train stranded under Boston Harbor due to a signal problem at one of the stations on Tuesday.