The raft placed and secured to the shore, the negro crouched in his hiding
place in a jungle of bushes. He soon reappeared, carrying four metal
tubes.
"The explosive is in the tubes," guessed Tom easily. "And at one end of
each tube is a sharp metal point that permits of being driven into the
crevices in the wall. Four, or more, of these tubes are thrust into the
wall, I suppose, and connected in series, so that they can be fired by the
same electric spark. These tubes and the wires are water-proofed. The
negro is only the dastardly workman in this case. It was never he who
invented the trick. But he must be an excellent workman, who ought to be
employed in much more honest effort. I wonder if the fellow is going to
use more than four tubes?"
All of these thoughts ran through the mind of Tom as he crouched, peering
eagerly at the negro.
By this time the negro was taking to the water, towing his miniature scow
and its explosive cargo as he swam.
"He must be a good swimmer, and also a good diver," concluded Tom. "With
my men patrolling the sea wall he must have to dive, some distance away,
swim under water, and remain there until he has secured one of the tubes
in place.
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