Exploding casket syndrome, as it is known in the death industry, occurs when these decomposition processes are not given adequate space to perform. In her awesome "Ask a Mortician" series, mortician Caitlin Doughty says, "You really want a decomposing body to have access to some sort of air so it can then dehydrate.

Do caskets explode underground?

Once a body is placed in a sealed casket, the gases from decomposing cannot escape anymore. As the pressure increases, the casket becomes like an overblown balloon. However, it's not going to explode like one. But it can spill out unpleasant fluids and gasses inside the casket.

Why do they cover your face before closing the casket?

Why do they cover your face before closing the casket? Their hair is combed and cream is placed on their face to prevent skin dehydration. The deceased is then covered and will remain in the preparation room until they are dressed, cosmetized and ready to be placed into a casket for viewing.