On Tue, 17 Apr 2012 09:09:27 +0100, "Brian Gaff"
wrote:

Well yes, but has anyone worked out what happens to the actual ground when
you do this kind of extraction. If people live above it all sorts of things
might occur with time.
Brian

Welcome to Blackpool - Twinned with Pisa.

--
Graham.
%Profound_observation%