Hence if this direction had not been changed during the night this was the Gulf of Mexico which lay beneath us.

A hot day was announced by the heavy livid clouds which clung to the horizon. These warnings of a coming storm did not escape the eye of Robur when toward eight o'clock he came on deck and took Turner's place at the helm. Perhaps the cloud-bank recalled to him the waterspout in which the "Albatross" had so nearly been destroyed, or the mighty cyclone from which he had escaped only as if by a miracle above the Antarctic Sea.

It is true that the forces of Nature which had been too strong for the "Albatross," might easily be evaded by this lighter and more versatile machine. It could abandon the sky where the elements were in battle and descend to the surface of the sea; and if the waves beat against it there too heavily, it could always find calm in the tranquil depths.

Doubtless, however, there were some signs by which Robur, who must be experienced in judging, decided that the storm would not burst until the next day.

He continued his flight; and in the afternoon, when we settled down upon the surface of the sea, there was not a sign of bad weather. The "Terror" is a sea bird, an albatross or frigate-bird, which can rest at will upon the waves! Only we have this advantage, that fatigue has never any hold upon this metal organism, driven by the inexhaustible electricity!

The whole vast ocean around us was empty. Not a sail nor a trail of smoke was visible even on the limits of the horizon. Hence our passage through the clouds had not been seen and signaled ahead.

The afternoon was not marked by any incident. The "Terror" advanced at easy speed. What her captain intended to do, I could not guess. If he continued in this direction, we should reach some one of the West Indies, or beyond that, at the end of the Gulf, the shore of Venezuela or Colombia. But when night came, perhaps we would again rise in the air to clear the mountainous barrier of Guatemala and Nicaragua, and take flight toward Island X, somewhere in the unknown regions of the Pacific.

Evening came. The sun sank in an horizon red as blood. The sea glistened around the "Terror," which seemed to raise a shower of sparks in its passage. There was a storm at hand. Evidently our captain thought so. Instead of being allowed to remain on deck, I was compelled to re-enter my cabin, and the hatchway was closed above me.

In a few moments from the noises that followed, I knew that the machine was about to be submerged. In fact, five minutes later, we were moving peacefully forward through the ocean's depths.

Thoroughly worn out, less by fatigue than by excitement and anxious thought, I fell into a profound sleep, natural this time and not provoked by any soporific drug. When I awoke, after a length of time which I could not reckon, the "Terror" had not yet returned to the surface of the sea.

This maneuver was executed a little later. The daylight pierced my porthole; and at the same moment I felt the pitching and tossing to which we were subjected by a heavy sea.

I was allowed to take my place once more outside the hatchway; where my first thought was for the weather. A storm was approaching from the northwest. Vivid lightning darted amid the dense, black clouds. Already we could hear the rumbling of thunder echoing continuously through space. I was surprised--more than surprised, frightened!--by the rapidity with which the storm rushed upward toward the zenith. Scarcely would a ship have had time to furl her sails to escape the shock of the blast, before it was upon her! The advance was as swift as it was terrible.

Suddenly the wind was unchained with unheard of violence, as if it had suddenly burst from this prison of cloud. In an instant a frightful sea uprose. The breaking waves, foaming along all their crests, swept with their full weight over the "Terror." If I had not been wedged solidly against the rail, I should have been swept overboard!

There was but one thing to do--to change our machine again into a submarine.