Despite my efforts I could find no underground construction, which is a riddle in itself.

The award-winning facility is noted for its mostly underground construction inside a hollowed-out hill.

Therefore, the project demanded an underground construction or, otherwise, a sustained one.

The project is predominantly an underground construction requiring high quality development and engineering excellence.

The test drilling for the underground construction at this site was started in 2009.

There was less underground construction here than elsewhere.

"Visibility really is a major problem with underground construction," said the group's executive director, Susan Nelson.

Since it was founded in 1976, the association has touted underground construction to business and government leaders.

A shift to underground construction would have increased the cost to as high as NT$134.4 billion.

There are many factors to assess when surveying a site for underground construction.