World's Only Moving Mud Puddle

If I was in charge of the state I would immediately order as many dump trucks as possible to dump as much rock down that hole and continue to dump until there is no possibility of any void left just keep doing it and keep doing it until it doesn't swallow anything else up problem solved eventually whatever the cavity is underneath going down to probably the Earth's mantle who knows how far it will be filled it will be filled the question is what will happen to the gases and the pressure will it cause a major explosion or will all the way to the Rock cap it off