Jules Verne

“ Pencroft and Neb, waving their torches, threw the light into every crevice; and at the same time, Harding, Gideon Spilett, and Herbert, their spears raised, were ready for any emergency which might arise. The enormous cavern was empty. The settlers explored it in every direction. There was nothing there, not an animal, not a human being; and yet Top continued to bark. Neither caresses nor threats could make him be silent.
"There must be a place somewhere, by which the waters of the lake reached the sea," said the engineer. ”

“ They could not but feel a certain awe, in this venturing into these unknown depths, for the first time visited by human beings. They did not speak, but they thought; and the thought came to more than one, that some polypus or other gigantic cephalopod might inhabit the interior cavities, which were in communication with the sea. However, Top kept at the head of the little band, and they could rely on the sagacity of the dog, who would not fail to give the alarm if there was any need for it. ”

“ The floor of the cavern must thus be situated ninety feet above the level of the sea.
"Here is our dwelling," said Cyrus Harding.
"But it was occupied by some creature," replied Gideon Spilett, whose curiosity was not yet satisfied.
"Well, the creature, amphibious or otherwise, has made off through this opening," replied the engineer, "and has left the place for us."
"Never mind," added the sailor, "I should like very much to be Top just for a quarter of an hour, for he doesn't bark for nothing!" ”