day the young inventor and his friends went aboard the M. N. 1
for the trial trip.

"You don't easily get seasick, do you?" Tom asked Mr. Hardley,
as they descended the hatchway into the interior of the craft.

"No, I'm considered a good sailor."

"Well, you'll need to be," went on Tom, with a smile. "Not that
we are likely to strike any rough water now, though the reports
say a stiff breeze is blowing in the bay. But when we once start
for the West Indies you are likely to experience a new sensation.
I've known sailors who never had any qualms, even in terrible
storms, to get ill in a submarine when she went through only a
small blow. The motion is different from that on a surface boat."

"I can imagine so," returned Mr. Hardley. "But I'll be thinking
of the millions in gold on the Pandora, and that will keep my
mind off being seasick."

"Let us hope so," murmured Tom.

He gave the word, they all descended, the hatch covers were
closed down, and the M. N. 1 was ready to start on a trial trip.



CHAPTER VIII

THE MUD BANK