"But where on earth did Nicolas learn that trick?" Tom wondered. "I shall
have to get him to show it to me. Plainly that trick is worth more than
all the muscle that I spent so many years in piling on."
Tom headed his course for the shore end of the wall. Here he would find
men in abundance. Moreover, now that the big black was a prisoner the men
would hardly be needed on the wall.
"I think I know just how Sambo worked it, too," the engineer reflected, as
he ran. "He swam out into the Gulf, towing that little scow behind him.
Neither his black head nor the little scow would be seen far on the water
on a dark night. Sambo, when he got near enough, could take one of the
metal tubes, swim in under water to some point where no watchman was near,
and stick the tube fast into the wall. Then another tube, and
another---all under water where they would not show to a passing watchman.
"Then, when he had all in place, and while no patrolling watchman was too
near, Sambo could begin to attach the wires. That would take but a few
minutes. Whenever any one came too near Sambo had but to swim out a little
way and tread water until he could return to his job. When, at last, all
was complete, Sambo would attach a wire from the bombs to a wire moored at
a stated point under water, and then swim in, work his magneto, and touch
the whole thing off from a safe hiding place on shore.
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