"Yes," laughed Jimmie, "and I suppose we'll leave the Sea Lion and go over the mountains in an open boat! I'm goin' to stick to the little old Sea Lion."
"Well," Frank remarked, after a short wait, "we must get back to the spot where Ned left us."
"Never thought of that!" Jimmie cried. "He may be yelling his head off because he can't come on board."
The boys lost no time in getting back to the first position, and then lifted to the surface. The conning tower, as before, was out of sight of anyone on the bay, the point of land intervening.
As the time passed the boys became anxious about Ned and Jack. They might have returned while the Sea Lion was away, they thought, and gone into the interior thinking that some accident had happened to the submarine.
"Anyway," Jimmie declared, "Ned told us to move along as my line gave out, and he must know that we'd come back to pick him up."
While the lads speculated on the possible outcome of the visit to the shore there came a sharp collision which keeled the Sea Lion over to port. Both were active in an instant.
"That's the Shark!" exclaimed Jimmie.
"It must be," Frank agreed.
Jimmie hastened to the stern and looked out of the plate glass panel there.