They were caught in the grip of the grass of the terrible Sargasso
Sea. Monstrous suckers grasped the boat in their powerful arms, and
had to be fought off. They were caught in a sea of boiling water and
imprisoned between big fields of ice.

By means of strong diving suits they were able to leave the ship and
walk about on the bottom of the sea. They visited a graveyard of
sunken ships, saw many strange monsters as well as many beautiful fish
in the great depths to which they sunk. Many times they were in dire
peril but the resources of the professor, the bravery and daring of
the boys, no less than the help Washington and Andy Sudds, the hunter,
rendered at times, brought them through.

Those of you who read of their adventures will recall the strange
island which they came upon in the Atlantic Ocean, far from the coast
of South America.

When they first drew near this island they were almost sucked into the
depths of a great whirlpool, caused by water pouring down a big hole
that seemed to lead far into the earth. They reversed their ship just
in time.

But, on going to another side of the island they were able to approach
safely, as at this point the great hole was farther from the shore.
Then they landed and investigated.

They found the island was almost circular, and the hole was also
round, but not in the center of the land. It was an immense cavity, so
wide they could not see across, and as for the depth they could only
guess at it. Looking down they could only see rolling masses of vapor