Their intended destination is never mentioned. It is simply implied, from things said by Ralph and Piggy, that the boys were being evacuated to a place of safety becasue Britain was involved in a nuclear war with 'The Reds.'
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The book takes place during the time of a war (World War 2) so the boys were put on planes to be taken somewhere safe, but their plane crashed on an uninhabited island when it was shot down by an unknown enemy.
Another answer: The boys are being evacuated from England, which is involved in some imagined future nuclear war against 'The Reds.'
If you bothered to read even the first two pages of the book you would know that the boys were travelling on a plane. The "passenger tube" of this plane was ejected during a storm because the plane was attacked. The "passenger tube" then crash landed on the island and was soon dragged out to sea by the storm, with many of the boys still on board.
I've included several quotes made by Piggy in the first chapter in this answer. It would seem that the boys were on an airplane and were being evacuated to a place of safety away from a war zone. It appears that the plane was then attacked and the pilot ejected the "passenger tube," containing the boys. Piggy says "He must have flown off after he dropped us. he couldn't land here. Not in a plane with wheels." Piggy also says, "I saw the other part of the plane. There were flames coming out of it." The ejected, pilotless, "passenger tube" crashed onto the island, where it caused a "scar" in the jungle. A storm, which also caused trees to fall, dragged the passenger tube out to sea, along with any children and adults who still remained on board.
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This was a set book when I was at school. The boys were indeed being evacuated, and apparently from Britain because some at least were "public school" pupils, though the war itself is unspecified. My school-days were a long time ago but I don't recall the text saying much about the crash. The pilot could not have "ejected the passenger tube" (fuselage) as that's not possible, so was that one of Piggy's suggestions?
How did they get rescued? A passing ship saw the fire signal and came to investigate.
Why did they get rescued? William Goulding wanted the story to have a happy ending.
his grandmother
The scar is the dent that the plane made on the island when it crashed into the island.
The plane was attacked but the pilot ejected a "passenger tube" containing the boys, which crashed onto the island leaving the scar in the jungle. According to Piggy... "that storm dragged it out to sea. It wasn't half dangerous with all them trees falling. There must have been some kids still in it."
the boys believe their plane was shot down by a fighter plane, since they are in the midst of World War II.
brought up in a rich family and whats to still maintain order wheter that be on the beach or at home