W worker walks along the first segment of the tunnel being built to connect the Port of Miami with Watson Island in Miami, Wednesday, March 14, 2012. The boring machine is nick-named "Harriet," after Harriet Tubman, the underground railroad activist. It cuts through the rock beneath Biscayne Bay, expels debris via conveyor belts, then builds the concrete walls of the tunnel's tube behind it. The $1-billion Port of Miami Tunnel is expected to be completed by May, 2014. (AP Photo/El Nuevo Herald, Roberto Koltun)