They followed the plan of moving about in ever-widening circles. Only in this way could they successfully cover the ground. It was the third day after the encounter with the devil fish that Tom, Ned and Mr. Damon were in the forward observation cabin. The eccentric man suddenly pointed to something visible from the starboard window.
"There's a wreck, Tom!" he cried. "Maybe it's the Pandora!"
Tom and the others hurried to Mr. Damon's side and peered out into the sea, illuminated by the great searchlight.
"That isn't the Pandora!" said the young inventor.
"But it's a wreck, isn't it?" asked Ned.
"Yes, it's a sunken vessel, all right," Tom assented. "But it's a reminder of the Great War. Look! She has been blown up by a torpedo!"
CHAPTER XXII
STUDYING CURRENTS
There was no question about Tom's statement. They had approached close to the side of a small, sunken and wrecked steamer, and in her side was torn a great hole. In the light from the submarine it could be seen that the plates bent inward, indicating that the explosion was from outside.