The sound of feet is isolated in the tunnel. Echoes of the slow steps of many fill the narrow space. We march in silence. Alone among the many. We do this odd ambitious walk twice daily. Twice daily this space is filled with the sound of the travelers and the workers. And what about the times that betwixt the twice daily commute? An ambiance like no other. A roaring silence. For those who have march here They leave behind an echo, an imprint of sort. More ghostly than any ghost. Haunting these tunnels with their essence When the sound of feet is not present.