Even though some said that it couldn't be done, a tunnel was built in 1994 in the English Channel, connecting England and France. The Channel Tunnel is the world's longest underground link, transporting more than ten million passengers annually under the sea. Series Information "Great Building Feats" reveals how and why the world's greatest structures were created and how engineering, geographical, technical, and human challenges were overcome during construction. Each building required the best minds of its time. They remain innovative and fascinating in both their creation and appearance.