41.   The line was never finished and the tunnel was never used.

42.   The thousands of trucks that have used the tunnel daily make it a major economic link in Europe.

43.   The tunnel has been used to transport guns and soldiers as well as food and supplies.

44.   The tunnel is used to bring food and supplies to Sarajevo when Serbs shut off the U.N. airlift and the one remaining road.

45.   Thousands of Okinawans, including children, were mobilized for the battle against the Americans in which underground tunnels were used.

46.   Tunnels were used to monitor communications and bring out refugees.

47.   Two brothers accused of using a tunnel to smuggle cocaine across the Arizona-Mexico border have been found guilty of drug and firearms charges.

48.   While in Zerqa, tunnels are used for other purposes.

49.   In quieter periods, the tunnel is used for evening dances.

50.   As well as the freight and car shuttles, the tunnel is used by the high-speed Eurostar passenger trains connecting London with Paris and Brussels.