In article .com,
lonelytraveller writes
I know, but on the big 3d picture of the construction thats on some of
the hoardings at street level, there is a tunnel between the northern
line/northern ticket hall, and the picadilly line, that joins up to the
one that currently goes from thameslink to the picadilly and the
victoria line.

Correct.

It would have to destroy the thameslink entrance/exit
stairs/escalators to do that, so you couldn't get from the thameslink
platforms to the thameslink station.

Completely wrong.

In diagrammatic form, heavily distorted:

HHHHH H = new Northern Ticket Hall
HHHHH
:
:
: : = proposed new passageway
:
PPPPPPPPPPPPPPPPPPPPPPPP P = Piccadilly Line platforms
: #
: #
: # # = existing passageway
::###
#
VVVVVVVVVVVVVVVVVVVVVVVV V = Victoria Line platforms
#
A--#--A
#
# EEEE E = Thameslink entrance
# EEEE
#### #
# #
TTTTTTTTTTTTTTTTTTT T = Thameslink platforms

The diagrams on the hoardings at King's Cross only show the tunnels
above the line A--A.

As you can see, the Thameslink station is unaffected.

In geographic terms, the Piccadilly platforms are under King's Cross
station, the Thameslink ones are south of the Pentonville Road (which
the Northern Line runs under), and the Victoria Line ones are under the
block of buildings with McDonalds at the southwest corner and (IIRC)
Tesco Metro at the northeast.

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