"What? Have you any doubts whatever of the effectiveness of your
brilliant and extremely original idea? Don't you think that the layers
of water, regularly disposed in easily-ruptured partitions beneath this
floor, will afford us sufficient protection by their elasticity?"

"I hope so, indeed, my dear friend, but I am by no means confident."

"He hopes! He is by no means confident! Listen to that, Mac! Pretty time
to tell us so! Let me out of here!"

"Too late!" observed the Captain quietly. "The trap-hole alone would
take ten or fifteen minutes to open."

"Oh then I suppose I must make the best of it," said Ardan, laughing.
"All aboard, gentlemen! The train starts in twenty minutes!"

"In nineteen minutes and eighteen seconds," said the Captain, who never
took his eye off the chronometer.

The three travellers looked at each other for a little while, during
which even Ardan appeared to become serious. After another careful
glance at the several objects lying around them, Barbican said, quietly:

"Everything is in its place, except ourselves. What we have now to do is
to decide on the position we must take in order to neutralize the shock
as much as possible. We must be particularly careful to guard against a
rush of blood to the head."

"Correct!" said the Captain.