Why are in this fairly big tunnel (seems to be the size of Underground tunnels) so less power lines?,(reply>), As Tom said the main cables have not been put in yet,(reply>), @CleverCrumbish I'm more thinking about traffic usage for emergency and utitlity services.,(reply>), +kilésengati The space is for access, if they filled it with more power lines the maintenance vehicles wouldn't be able to get down it.