41.   At the time the Red Line tunnel was built engineers thought dense concrete could resist the water, but micro-fractures have developed over time.

42.   However, tunnels would be built under road junctions to enable Palestinians to travel between the various Palestinian cities without encountering Israeli army checkpoints.

43.   Israel maintains building the tunnel was not a political act.

44.   La Republica newspaper said professional miners started building the tunnel in January, with four-man teams working in four-hour shifts.

45.   The idea of building a tunnel under the Strait of Gibraltar is an old one, but little progress has been made on the project over the years.

46.   The rebels cancelled talks with the government earlier this month after complaining that authorities were building the tunnel.

47.   The tunnel could be built in two phases.

48.   The tunnel was originally built to assist the Soviet invasion.

49.   The workers were building the tunnel to protect motorists from landslides, a problem on the superhighway since it opened about a year ago.

50.   The workers were building the tunnel to protect motorists from landslides, a problem on the highway since it opened about a year ago.