AFAIR one idea was for an underground station at Camberwell and
then to
surface by Peckham Rye and run over the existing lines to Lewisham.
Actually, the Bakerloo like was dug (and as far as I know still
there) to right under Camberwell Bus Garage, apparently you can get
to the tunnel from the bus garage. Other than the associated
problem of the fact that there's a bus garage right on top this
would be a relatively cheap way of extending it to Camberwell.
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