From the wonderful spEak You’re bRanes.
Everything “built” underground is a lie, it’s true. The Bakerloo, Central and Northern lines are all ficticious and water is brought to your taps by Enchanted Cats (with buckets). Don’t ever dig a hole deeper than 9 foot, in case you break through into Shangri-La and Madame Blavatsky curses you to only ever spout bollocks. Believe me, I know.