How modern is modern? The not so little collection of bottles and other artefacts shown on the clip look like the same sort of late 19th century/early 20th century stuff that I work with all the time. WA only having been settled a decade or so before these tunnels were built. A lot of American archaeology is no older then these tunnels too. We have still built a whole productive discipline around it.

Gaye

-----Original Message-----
From: HISTORICAL ARCHAEOLOGY [mailto:[log in to unmask]] On Behalf Of Holland, Jeff
Sent: Wednesday, 13 March 2013 4:54 AM
To: [log in to unmask]
Subject: Re: Liverpool's lost Williamson tunnels unearthed

Our investigations in the tunnels were very limited because of safety. We had a structural engineer on site to evaluate the stability of the one tunnel that we entered. There was no excavation and only a few modern artifacts recovered. 

The city was a bit disappointed that we didn't use cameras mounted on robots or some other high tech approach, but the budget did not allow it. Certainly remote sensing is a legitimate approach, especially for mapping the extent of a network of tunnels, although any number of obstacles could prevent access of a robotic vehicle.