They can be checked by no external force; they must themselves dig their own grave, having previously created their own gravedigger.
You may want to consider asking a local gravedigger who is used to working in graveyards if he could dig the excavation for you.
gravedigger in the form of the proletariat.
The word usage examples above have been gathered from various sources to reflect current and historial usage. They do not represent the opinions of YourDictionary.com.