Now that I look at the picture, I am not 100% positive that they are dead. Do snails sleep on their backs? Do snails sleep at all? Do snails dream? Maybe they are just tucked up nice and tight, way down in those shells. Maybe they are having a sleepover. I don’t know the story. Maybe one is dead, and the other just lay down beside that one to die also. Whatever happened, there must be a story behind it.