d those to front and rear
revealed the forward and aft aspects of the panorama, thus affording a
clear view in every direction.

This, then, was the television device Professor Stevens had referred
to the previous afternoon, its mechanical eyes enabling then to search
every square inch of those mysterious depths, as they cruised along.

It was the central square that occupied their attention chiefly,
however, as they stood studying the panel. While the others
represented merely an unbroken vista of greenish water, this one
showed the sea floor as clearly as though they had been peering down
into a shallow lagoon through a glass-bottomed boat, though it must
have been a quarter of a mile below their cruising level.

A wonderful and fearsome sight it was to Larry: like something seen in
a nightmare--a fantastic desert waste of rocks and dunes, with here
and there a yawning chasm whose ominous depths their ray failed to
penetrate, and now and then a jutting plateau that would appear on the
forward square and cause Captain Petersen to elevate their bow
sharply.

But more thrilling than this was their first glimpse of a sunken
ship--a Spanish galleon, beyond a doubt!

There she lay, grotesquely on her side, half rotted, half buried in
the sand, but still discernible. And to Larry's wildly racing
imagination, a flood of gold and jewels seemed to pour from her ruined
coffers.

* * * * *

Turning to Diane, he saw that her eyes too were flashing with intense
excitement.

"Say!" he exclaimed. "Why don't we stop and look her over? There may
be a fortune down there!"

Professor Stevens promptly vetoed the suggestion, however.

"I must remind you, young man," he said severely, "that this is not a
treasure hunt."

Whereupon Larry subsided; outwardly, at least. But when presently the
central square revealed another and then another sunken ship, it was
all he could do to contain himself.

Now, suddenly, Diane cried out:

"Oh, daddy, look! There's a modern ship! A--a freighter, isn't it?"

"A collier, I would say," was her father's calm reply. "Rather a large
one, too. _Cyclops_, possibly. She disappeared some years ago, en
route from the Barbados to Norfolk. Or possibly it is any one of a
dozen other steel vessels that have vanished from these seas in recent
times. The area of the Sargasso, my dear, is known as 'The Port of
Missing Ships.'"

"But couldn't we drop down and make sure wh