What most commuters of Amtrak trains crossing the Hudson River do not have the opportunity to see, was witnessed by U.S. Senator Cory Booker and Amtrak officials. View of the damaged from hurricane Sandy 105-year old rail tunnels was recorded on video, showing the spalling and corrosion on the concrete bench walls. It is estimated that the tunnels have about 20 years of life, before they are shut down for repair works. Replacement of the tunnels is also examined by officials, with total cost being estimated at $20 billion.