"Dynamite!" quickly exclaimed Mr. Alcando. "And who would dare to explode dynamite at the dam?"
"I don't know who would do it, but some of the enemies of the United States might. Or someone who fancied the Canal had damaged him," the captain went on.
"And who would that be?" asked Blake in a low tone.
"Oh, someone, or some firm, who might fancy that the Canal took business away from them. It will greatly shorten certain traffic and trade routes, you know."
"Hardly enough to cause anyone to commit such a crime as that, do you think?" asked the Spaniard.
"That is hard to answer," went on the tug commander. "I know that we are taking great precautions, though, to prevent the dam, or the locks, from being damaged. Uncle Sam is taking no chances. Well, have you pictures enough?"
"I think so," answered Blake. "When we come back we'll stop off here and get some views from below the dam, showing the spillway."
"Yes, that ought to be interesting," the captain agreed.
The tug now steamed on her way out into Gatun Lake, and there a series of excellent views were obtained for the moving picture cameras. Mr. Alcando was allowed to do his part. He was rapidly learning what the boys could teach him.
"Of course it could never happen," the Spaniard said, when the cameras had been put away, for the views to be obtained then were of too much sameness to attract Joe or Blake, "it would never happen, and I hope it never does; but if it did it would make a wonderful picture; would it not?" he asked.