The tunnel holds a sophisticated system of emergency detection equipment, including video cameras and strobe lights.
Even today, despite a sophisticated system of ditches and tunnels, floods can suddenly strike.
He is thought to be moving within a sophisticated system of underground bunkers, and remains elusive.
Theoretically Russian forestry is highly regulated with a sophisticated system of permits, regulations, export controls, and rangers.
Snowpacks on its mountain ranges - essential once they melt for replenishing the state's sophisticated system of underground reservoirs - were unusually thin.
He and other experts said Cuba, where Elian may eventually return, has a sophisticated system of psychiatric care and many highly trained child psychiatrists and psychologists.
The U.S. has the world's most sophisticated system of financing radical ideas, and the results have been impressive, from Google to Facebook to Twitter.
"On the ground you just see lumps and bumps," says Evans, "but this aerial view shows a very sophisticated system of road networks, planned neighbourhoods and intricate waterworks.
He brought into his written English the sound, traditions and the influence of cynghanedd (an ancient, sophisticated system of Welsh alliteration) from the Welsh he heard around him.
But as soon as next year, the new Transportation Security Administration hopes to begin using a more sophisticated system of profiling airline passengers to identify high-risk fliers.
