On 19 Jul, 21:48, rosenst...@cix.co.uk (Colin Rosenstiel) wrote:
> In article
> ,
>
> thagor2...@googlemail.com () wrote:
> > The its-difficult-to-tunnel excuse no longer holds water in the
> > 21st century
>
> So we have new geology in the 21st century? What's changed pray?

Tunnelling technology , what do you think? The channel tunnel was
built through dozens of miles of water bearing chalk under the sea so
I don't think the "its nasty chalk not clay" really cuts it any more
as an excuse not to build tunnels in south london.

B2003

In article
,
thagor2008@googlemail.com () wrote:

> On 19 Jul, 21:48, rosenst...@cix.co.uk (Colin Rosenstiel) wrote:
> > In article
> > 
> ,
> >
> > thagor2...@googlemail.com () wrote:
> > > The its-difficult-to-tunnel excuse no longer holds water in the
> > > 21st century
> >
> > So we have new geology in the 21st century? What's changed pray?
> 
> Tunnelling technology , what do you think? The channel tunnel was
> built through dozens of miles of water bearing chalk under the sea so
> I don't think the "its nasty chalk not clay" really cuts it any more
> as an excuse not to build tunnels in south london.

Huh? Chalk has pretty similar tunnelling characteristics to clay. It's
the sand in south London that's hopeless. Look at how they built the JLE.

-- 
Colin Rosenstiel

On Jul 20, 11:25 pm, rosenst...@cix.co.uk (Colin Rosenstiel) wrote:
> In article
> ,
>
>
>
> thagor2...@googlemail.com () wrote:
> > On 19 Jul, 21:48, rosenst...@cix.co.uk (Colin Rosenstiel) wrote:
> > > In article
>
> > ,
>
> > > thagor2...@googlemail.com () wrote:
> > > > The its-difficult-to-tunnel excuse no longer holds water in the
> > > > 21st century
>
> > > So we have new geology in the 21st century? What's changed pray?
>
> > Tunnelling technology , what do you think? The channel tunnel was
> > built through dozens of miles of water bearing chalk under the sea so
> > I don't think the "its nasty chalk not clay" really cuts it any more
> > as an excuse not to build tunnels in south london.
>
> Huh? Chalk has pretty similar tunnelling characteristics to clay. It's
> the sand in south London that's hopeless. Look at how they built the JLE.

Chalk , sand , whatever. Point is theres nothing that can't be
tunnelled through now as long as they money is available. If they
think sand is an issue they should go ask the Egyptions how they built
the cairo metro.

B2003

thagor2008@googlemail.com wrote:

> If they
> think sand is an issue they should go ask the Egyptions how they built
> the cairo metro.
> 
Israelite slaves? Oh, no - they had to make bricks without sand.

Peter Beale