The death of Simon was one of the quiet moments because everyone was in shock.
When Piggy died everyone just stood still in silence because of their inhumanity
everyone was in silence in fear when they heard of the monster on the island.
When they were finally rescued they were in silence because they were speechless because they never thought that they would escape this island.
When a ship passed by but the fire went out because no one was paying attention to it. That is