Funeral Consumers Alliance

My sister is considering an above the ground burial, but is not sure if bugs can enter the casket of those buried in those walls. We were told when we buried our parents that they would stay intact and look as if they were just buried for about 25 yeras. This isn't true? There's the "stew" you spoke about. That happens in mausoleums too? Bugs happen too? Isn't cremation cleaner? Ann