You asked: Where is the longest escalator on the London Underground?

What is the deepest station in the tube?

Hampstead station, on the London Underground network, located at 58.5 meters below ground level. It is the deepest station of the London Underground.

How far down is the Piccadilly line?

The Piccadilly line is a deep level London Underground line running from the north to the west of London. It has two branches, which split at Acton Town, and serves 53 stations.

Piccadilly line
Technical
Line length 45.96 mi (73.97 km)
Character Deep Tube
Track gauge 1,435 mm (4 ft 81⁄2 in) standard gauge
THIS IS FUN:  What is the cheapest way to ship from US to Ireland?