OK, lets gather the evidence.
We know, definitely, there's a tunnel under Dial House going somewhere.
We know, definitely, there's a tunnel under the corner of North Hanover Street and Cathedral Street.
We know there was a NATO room under the old GPO building in George Square.
There's evidence of a tunnel, or something, under the Hope Street Post Office.
There are stories of secret bunkers under George Square.
The tunnel under North Hanover may go to Dial House (most probably).
The tunnel may go to the GPO building in George Square.
A tunnel may extend all the way to the Royal Infirmary.
There are stories of tunnels from the City Chambers to the other side of George Square somewhere.
Anything I missed?
So, we are dealing with the GPO (still under Government control), NATO, and possibly the Council since they would have moaned that they were getting left out.
The GPO would have been more than happy for NATO to pay for all these underground tunnels etc., saves them a fortune.
The other sites in Britain have a maze of tunnels and rooms for their underground exchanges, of which there is supposed to be one under Glasgow too.
So what are we looking for?
Major GPO sites in the city centre, which are now either Royal mail, British Telecom, or in some cases, in private hands now.
I'm sure I've missed something, I'll remember as soon as I hit that Submit button.