HCA: Hermit Crab Association

Both my crabs have buried themselves and they recently stopped making digging noises at night. They're both under sperate water bowls and I don't want to move them in case they are molting. I mist the corners of the tank to keep the humidity under there.

But if they are dead, will I be able to smell them without having to dig them up?

Not always. How long have they been under? It's normal not to hear them moving around under there once they settle on a spot. Have you read the article on molting? It may help to ease some of your worries.