The magnificent frontier pass, or "the Underground Great Wall",
built in the Song Dynasty (960-1127), has been listed as one
China's national protected cultural relics in 2006. It will be
opened to the public in the near future.
"The Underground Great Wall" is located in Yongqing County,
Hebei Province. In the Song Dynasty, it was an ancient battlefield
between Song and Liao states (916-1125). The well-known Yang family
generals had once fought there. The ancient underground fortress
was found there in the 1950s, with sophisticated structures and
magnificent scale. Blue bricks for building the pass were also
carefully made. Experts believe it must be built under the
direction of the Board of Works in the Song Dynasty.
Military establishments like bunkers and living necessities like
lamp stands and heatable brick beds can also be found.
According to Yongqing's county annals, part of the county had
been occupied by Liao. Experts believe the underground structure
used to be a military defense line. The imperial records, folklore
and archeological finds all help to judge the underground defense
line's current situations. It is about 90 km long, occupying an
area of 1,600 sq m.
Chinese archeologists said the underground bulwark had similar
functions as the Great Wall, so it is also a great discovery in
China's archeological history.
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(Chinanews.cn August 24, 2006)
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