And they saw above them a white shining disk like a very large and very bright moon.

It was the light of day.
'Some one has opened the trap-door,' said Lucy.

'The Ingots always closed their treasure-vaults with trap-doors.' The bright disk was obscured; confused shapes broke its shining roundness.

Then another disk, small and very black appeared in the middle of it; the black disk grew larger and larger and larger.

It was coming down to them.