"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
"What's that noise?" asked Mr. Hardley.