In The Cay by Theodore Taylor, do you think Timothy really believed that he and Phillip would be discovered by a plane or a ship? Why?

In The Cay by Theodore Taylor, Timothy always tried to stay positive about a rescue for Phillip's sake, and though I think he also remained hopeful, I do not think Timothy thought there was much chance of them being rescued. Timothy figured that the little island they were on was way back in the Devil's Mouth, and he knew that ships could not get there easily, and that their cay was so small, it would be difficult to see from the air. Because of this, Timothy worked hard at teaching Phillip everything he could about survival on the island. He knew that he might not be around long enough to be rescued, and he wanted to leave Phillip with enough knowledge and skill to get by without him.