"Come aboard of us, Matt!" shouted the man, whirling a rope about his head and letting it fly.
The youth's ears were filled with the poppety-pop of the submarine's motor, but he heard the request. He could only guess how the submarine happened to be there, and guesses were useless, for he would soon be told everything about the queer situation.
Motor Matt grabbed at the rope as it was thrown to him by the man in the submarine.
As he hauled himself toward the Grampus, hand over hand, he saw that the man in the conning tower was Townsend, or Captain Nemo, Jr., as he preferred to be called when afloat.
Presently the young motorist was hauling himself up on the slippery deck of the submarine.
"Are you all right, Matt?" cried Captain Nemo, Jr.
"All right, captain," answered Matt, "except that I'm as wet as a drowned rat and can hardly understand why I was thrown from the steamer."
"You were thrown overboard?" demanded the captain.
"Yes; by your man, Sixty."
"My man? I don't understand you. But we'll let that go for now. Dick and Carl are in that boat yonder. Shall we take them aboard?"