1.   Building the tunnel presented a major challenge to engineers.

2.   Later tunnels were built with towpaths which dispensed with the need for legging.

3.   The contractors will start building the tunnel next month.

4.   To build the tunnel they had to bore through solid rock.

5.   Miners built the tunnel to drain water out of the mines.

6.   And building tunnels is almost a national sport, which means other nuclear plants may be hidden away where inspectors cannot roam.

7.   Before the foundation bought Memorial Hall, it unsuccessfully negotiated the right to build a tunnel through the basement of the Confederate Museum to connect its two Ogden museums.

8.   A Russian counterintelligence official, however, is quoted as saying that the United States did not build a tunnel under the embassy.

9.   A Russian counterintelligence official is quoted as saying that the United States did not build a tunnel under the embassy.

10.   A tunnel could be built, advocates say, in about two years, while keeping traffic moving on the existing highway, with little effect on the neighborhoods.