Another thing. The ship may have moved on
several fathoms, or even a mile or two, after her last position
was taken before she went down. In that case she'd be all the
harder to find. And even granting that she sank where you think
she did, the ocean currents since then may have shifted her. Or
she may be covered by sand."
"Covered by sand!" exclaimed the gold-seeker.
"Yes," replied Tom. "The bottom of the ocean is always changing
and shifting. Storms produce changes in currents, and currents
wash the sand on the bottom in different directions. So that a
wreck which may have been exposed at one time may be covered a
day or so later. We'll have to keep on searching. I'm not ready
to give up."
"Maybe not. But I am!" snapped out Mr. Hardley.
"What do you mean?" asked the young inventor.
"Just what I said," was the quick answer. "I'm not going to
stay down here, cruising about without knowing where I'm going.
It looks to me as if you were hunting for a needle in a
haystack."
"That's just about what we are doing," and Tom tried to speak
good-naturedly.
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