The Worm's hole appeared to breathe forth death in its most repulsive forms.

The friends, with one impulse, moved to the top of the Brow, where a fresh breeze from the sea was blowing up.
At the top of the Brow, beneath them as they looked down, they saw a shining mass of white, which looked strangely out of place amongst such wreckage as they had been viewing.

It appeared so strange that Adam suggested trying to find a way down, so that they might see it more closely.
"We need not go down; I know what it is," Sir Nathaniel said.

"The explosions of last night have blown off the outside of the cliffs--that which we see is the vast bed of china clay through which the Worm originally found its way down to its lair.

I can catch the glint of the water of the deep quags far down below.