Piggy concludes that no one will know where they are because of the possibility of the atom bomb. He emphatically reminds Ralph:
"They're all dead," said Piggy, "an' this is an island. Nobody don't know we're here. Your dad do't know, nobody don't know--" (14).
Piggy's panicked spiel does contain some logic. The plane crashed in the middle of the Pacific Ocean en route to Australia, and the pilot and crew most likely died on impact. Because of the wartime conditions, it is very unlikely that the pilot would have radioed their location during an attack. Beyond the crash of their own plane, the possibility of a devastating nuclear attack loomed large in Piggy's mind; the boys may have originally been evacuated to escape the danger of the rising nuclear conflict.