There are always accidents, deaths even, involved in underground excavation.

It expresses the quality of the rock mass in the so-called Q-value, on which are based design and support recommendations for underground excavations.

The bulk of the of the work however, including underground excavation, is to be carried out by the operator.

Due to the presence of underground excavations, the hospital was placed on driven piles for support.

It was also announced, sometime later, that the underground excavations of the curia would be opened to the public in 2013.

This is achieved by mining (through underground excavations or open workings), but also by processing plants.

Why even begin the underground excavation before you were sure that the object of your search wouldn?

Perhaps the most interesting part of the tour is the underground excavation of the Viking and Norman Defenses.

Soil nailing evolved from the New Austrian Tunneling method which is a system for underground excavations in rock.

It was an underground excavation, an archaeological dig.