molly grahm will talk more about this. we are taking a look at our live shot. we understand that there will be 44 giant jackhammers? > > this weekend there will be an enourmous amount of demolition. >> we want people to pay attention to our progress over the weekend. there has been an enormous amount of planning. we want people to track our progress is to make sure we are getting a more marked. >>darya: is there any possibility they you could finish early? >> there is the possibility. optimistically, really optimistic would be midnight, 3:00 a.m. is possible. we will open the roads as soon as we can but there is a lot of work to be done. >>darya: will we know this esthetically that this is this a better approach to the golden gate? >> absolutely. it is a great design. ultimately this is the end of the first stage. we still have to build the rest of the project. it will be a really great improvement for the presidio and the entire area of the northern water from. >>darya: we are going to have to share one's tunnel monday morning. there will be a lot of traffic i