The_Complete_Chronicles_of_Narnia_(volumes_1-7,_in_order_of_publication)

During the hour or so that followed Jill sometimes thought that Puddleglum was right
about the lamps, and sometimes thought it was only her imagination. Meanwhile the land
was changing. The roof of Underland was so near that even by that dull light they could
now see it quite distinctly. And the great, rugged walls of Underland could be seen
drawing closer on each side. The road, in fact, was leading them up into a steep tunnel.
They began to pass picks and shovels and barrows and other signs that the diggers had
recently been at work. If only one could be sure of getting out, all this was very cheering.
But the thought of going on into a hole that would get narrower and narrower, and harder
to turn back in, was very unpleasant.
At last the roof was so low that Puddleglum and the Prince knocked their heads against it.
The party dismounted and led the horses. The road was uneven here and one had to pick
one's steps with some care. That was how Jill noticed the growing darkness. There was
no doubt about it now. The faces of the others looked strange and ghastly in the green
glow. Then all at once (she couldn't help it) Jill gave a little scream. One light, the next
one ahead, went out altogether. The one behind them did the same. Then they were in
absolute darkness.
"Courage, friends," came Prince Rilian's voice. "Whether we live or die Aslan will be our
good lord."
"That's right, Sir," said Puddleglum's voice. "And you must always remember there's one
good thing about being trapped down here: it'll save funeral expenses."
Jill held her tongue. (If you don't want other people to know how frightened you are, this
is always a wise thing to do; it's your voice that gives you away.)
"We might as well go on as stand here," said Eustace; and when she heard the tremble in
his voice, Jill knew how wise she'd been not to trust her own.
Puddleglum and Eustace went first with their arms stretched out in front of them, for fear
of blundering into anything; Jill and the Prince followed, leading the horses.
"I say," came Eustace's voice much later, "are my eyes going queer or is there a patch of
light up there?"
Before anyone could answer him, Puddleglum called out: "Stop. I'm up against a dead
end. And it's earth, not rock. What were you saying, Scrubb?"
"By the Lion," said the Prince, "Eustace is right. There is a sort of -"
"But it's not daylight," said Jill. "It's only a cold blue sort of light."
"Better than nothing, though," said Eustace. "Can we get up to it?"