He gave a frantic yank, and both lay on the flooring of the raft.

Sam was saved.
"The shark!" gasped Tom, when he could speak.

"Did it--it--bite you ?" "No, but it grazed my shoulder," answered Sam.

"If I had not dived down, I would have lost an arm at the very least." When they felt able they looked around, but the shark had disappeared.
"That settles it," said Tom.

"We must be careful and keep out of this water in the future.