In message , at
21:33:28 on Mon, 19 Sep 2005, mocha remarked:

What is the deepest platform below ground level?

Hampstead. Because the ground there is very high.

The general topic of "deepest below sea level" was also debated about a
month ago. I'm not sure we came to a definite conclusion, but it could
be Westminster-Jubilee, or if you count the DLR, perhaps Cutty Sark.
It's definitely not Waterloo, although the deepest *line* (below sea
level) is near there.
--
Roland Perry