Thanks for the information. I have been trying to follow it. I had just 
been reading "Vikings in Ireland and Scotland in the Ninth Century"
by Donnchadh Ó Corráin, Department of History, National University of 
Ireland, Cork (ISBN 2-503-50624-0) and there is references from the 
Cologne archive that place the Vikings from the "kingdom of Lothlend, 
Laithlind or Lochlainn" there sometime between 825-859 CE. An 
important archive that will be missed for some time, and in part forever.

I found the animation of the disaster informative as it showed how it 
could have led to a greater loss of life if not for the quick thinking of the 
workers in the subway tunnel who perceived the impending disaster, 
stopping traffic and alerting those working in the archives on the 
surface. 

It seems hydrostatic pressure has caused the slip and fall of what we 
here sometimes call a "slurry wall" which I've worked alongside the 
construction of by a French firm back in 1984 while in urbban 
archaeology in New York City. A water displacing bentonite "slurry" is 
pumped through a channel dug to whatever base, in bedrock, chiseled 
into, rebar cages lowered and concrete pumped displacing the slurry 
monitored for content, filtered and recharged a section at a time. It 
apparently was used in the World Trade Center so-called "bath-tub" 
design and the former US Federal Assay Site, recently sold as the most 
expensive property in Manhattan, per square foot, two blocks from the 
East River, NYC where a large crew recovered over 1 million artifacts in 
1984.

Personally terms such as "bath-tub" and "ground zero" do nothing for 
our field often a part of tourism to the original significant sites these 
terms come from, in my opinion, once working in the now demolished, 
could have saved it's facade building on Trinity Place nearby and for the 
firm which conducted the orginal archaeology survey of the US Army's 
Fort Drum, NY in 1983 once located in the 90s of floors of the WTC, 
tragically struck on Sept. 11, 2001. 

By the way an 18th horse harness was recovered in the orginal 
construction of Building 7 there and is conserved at the Long Island 
Science Museum, NY. The towers construction had seen a ship hulk in 
landfill and later when I accompanied archaeologist Edward 
Johanneman, MA to Building 7 to look further, we were denied access.