From [1], "Hampstead is the deepest station below the surface, at 58.5 metres (192 ft), as its surface building is near the top of a hill". So the deepest is a

From [1], "Hampstead is the deepest station below the surface, at 58.5 metres (192 ft), as its surface building is near the top of a hill". So the deepest is about 60m, but from browsing around, it seems many are at least 40m deep. [1]: https://en.wikipedia.org/wiki/London_Underground_infrastructure#Stations https://en.wikipedia.org/wiki/London_Underground_infrastruct...