Then he noted a peculiarity in the cap of the experimental torpedo. It had slots, which were backed with metal strips that could be moved away.
Harry did not know the exact purpose of these; they probably had to do with some invention planned by Professor Whitburn; but they would solve the problem that was now involved.
Harry seemed to have gained new strength. He lifted Arlette, resting her on his good arm, and carried her to the torpedo tube. She did not realize what he was about until he had slipped her into the shell. Then she gazed at him in bewilderment.
“What — what are you doing?” she asked.
Harry smiled reassuringly. He was shoulder-deep in water now. The high-set tube was just barely free of the rising flood.
“Sending you to safety,” he replied. He lifted the cap of the torpedo. “Do you see these movable metal pieces in the cap?”
“Yes,” replied Arlette.
“Wait until the torpedo is floating steadily,” said Harry. “Then open the one that is above you. It will let in air.”
“But Harry!” exclaimed Arlette, as she began to understand. “I can’t leave you here — “
Harry had expected to hear her say that. He smiled grimly, as he was about to lower the cap of the torpedo.