"Look!" he exclaimed. "There's part of a wreck!"
Ned, Mr. Damon, and Tom looked out and saw, sweeping past them,
the ribs and worm-eaten timbers of some craft, lying on the
bottom of the river.
"Yes, that's the remains of an old brick scow," the young
inventor explained. "That's one of our water-marks, so to speak.
It is at the bend of the river. We turn now, and head for the
bay."
As he spoke they all became aware of a sudden swerve in the
course of the submarine. The helmsman had, doubtless, noted the
"water-mark," as Tom termed it, and as an automobilist on land
might swing at the cross-roads, the steersman was changing the
course of his craft.
"We'll go deeper," said Tom a moment later, as the wreck passed
out of view. "We can go about fifty feet down now. Yes, he's
sinking her," he added, as a gauge showed the craft to be
descending. "Nelson knows his business all right."
"He is your captain?" asked Mr. Hardley.
"One of the best, yes. He'll go with us on the search for the
Pandora."
They talked of various matters, Tom relating to Mr.
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