In message
m, at 06:05:42 on Sun, 22 May 2011, Mizter T remarked:
There could also have been a communicating tunnel between the Northern
Ticket Hall and the Thameslink platforms, for tube passengers, to balance
it out.

Right through the sewer?

Apparently it was already diverted (see bottom of page 1) and it's only a
foot tunnel needed.

http://www.bacsol.co.uk/images/uploa...5StPancras.pdf
--
Roland Perry