Here's one of those 3d diagrams for Liverpool Street/Moorgate :http://
www.crossrail.co.uk/80256B090053AF4C/Files/liverpoolstreet3d/$FILE/liverpool+street+3d_lg.jpg

The grey bits are the old station (and the even paler grey bits,
unhelpfully added, are the streets).

If you look closely though, there are bits of the 'old station(s)'
that make no sense:
-a rectangular bit west of the central line, and west of the disused
curve for the metropolitan line, at liverpool street.
-two very thin tubes (which look too small for lift shafts), just to
the right of that rectangular bit
-a long passage below and slightly south of the main ticket hall at
moorgate, and just north of the metropolitan line (just beyond the
east end of the platforms). This passage has a curve to the south at
the western end
-a long thin passage directly above the northern line, and parallel
with it, south of the platforms (and south of the ticket hall).
-a round/circular room under the steps that lead from the ticket hall
to the east side of moorgate. A long passage passes next to it, with
junctions towards it, so this may be some form of disused lift shaft,
but I thought that the northern line ticket hall had always been on
the west side of moorgate?
-a strange short passage, with some sort of disc around the middle,
below the east end of the long passage by that circular room

Does anyone know the explanations for these?