The excavation for the new underground station Bonner Wall in the south of
Cologne, seen from the southern end on 22 July 2006. This is in fact the eastern
half of the pit, where the tunneling machine "Tosca" was lined up in April.
Since the start of the drilling on 6 June it has made 240 m, thus from here only
the empty tunnel is still visible in the background. The narrow gauge line
running into the tunnel is used to bring the concrete segments for the lining,
the excavated ground is transported through the pipes on the left (mixed with
bentonite suspension). The wide pipe at the top is used for the ventilation.
The startup of the new underground line is planned for 2010.
<p>
Digital photo by
<a href="http://www-users.rwth-aachen.de/christoph.schmitz2/index.html">Christoph
Schmitz</a>
(<a href="mailto:christoph.schmitz2@post.rwth-aachen.de">christoph.schmitz2@post.rwth-aachen.de</a>)