Big digs and big dangertake a tour of the worlds greatest tunnels. How do tunnels stay dry under water? Who dug the first tunnels? Go underground with David Macaulay and get an amazing look at tunnels through spectacular film footage, little-known facts and dramatic recreations. From ancient Rome to the remarkable Channel Tunnel that connects France and England, Tunnels introduces courageous engineers, relives deadly disasters, and reveals little-known personal triumphs and tragedies.