On 15 Dec, 14:41, Mr Thant
wrote:
On 14 Dec, 17:42, lonelytraveller

wrote:
To the south would
be so far away from the other exits and entrances that it would be
ridiculous connecting to it, so the north is the only sensible place.

But that's where it's going. The safeguarding shows the route as being
along the south side of Euston Road. Sheet
16:http://www.dft.gov.uk/consultations/...ckney/pdfsheet...
Gosh, Secret Entrance at Buckingham Palace anyone?

It goes very close to the southeast entrance to the WWII bunker at
Goodge Street (now the "Eisenhower Centre" as well.

and the ones that have already
happened at Angel (that's presumably why the cross passages there are
so wide and have very wide fire exit doors in the middle of them).
I presume they connect to the liftshafts and old entrance building
somehow. They're a long way southeast of the current entrance, which
the safeguarding passes west of. I'd think the interchange route would
have to join up at the mid-escalator passageway.
The old entrance is at the west end of the wide north platform (where
southbound trains go), behind the metal doors and half-way up the
wall, via a ladder.