"Roland Perry" wrote in message
...

The old Northern Line lift shafts are to the west of the new lift, and
according to Clive Feather's website there is an older emergency lift
(which is most likely to be in that vicinity). I wonder if this is a
connecting passageway to that emergency lift.

It isn't at all unlikely that there are unsigned links for use by the
maintenace staff of the fire brigade. Who knows what is provided for at
lower levels connected to the surface emergency access - I don't recall ever
seeing details of the 'back of house' at lower levels in any of the many
drawings I've found, or have been linked to here...

Paul S