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TOM SWIFT AND HIS SUBMARINE BOAT
ship was about to be made. The craft was now outside the line of breakers and in the open sea.
"Is everything ready, Tom?" asked his father in a quiet voice.
"Everything," replied the lad nervously, for the anticipation of being about to sink below the surface was telling on them all, even on the calm, old sea captain.
"Then open the tanks and admit the water," ordered Mr. Swift.
His son turned a valve and adjusted some levers. There was a hissing sound, and the Advance began sinking. She was about to dive beneath the surface of the ocean, and those aboard her were destined to go through a terrible experience before she rose again.
