Largely underground

'Notice how all these passages are sloping downwards!' called out Mr Wonka. 'We are now going underground! All the most important rooms in my factory are deep down below the surface!'

'Why is that?' somebody asked.

'There wouldn't be nearly enough space for them up on top!' answered Mr Wonka. 'These rooms we are going to see are enormous! They're larger than football fields! No building in the world would be big enough to house them! But down here, underneath the ground, I've got all the space I want. There's no limit — so long as I hollow it out.'

***

Chapter 14, Charlie and the Chocolate Factory