Why are heavy machines not able to move Hanuman idol at temple in MP?

Heavy machines haven't been able to move Hanuman idol at a temple in MP, even as temple was demolished for road widening. "The idol was made from special basalt stone found in Malwa region...It seemed to have been installed using locking system," archaeologist Raman Solanki said. "In this method, holes were drilled into stones to construct grand temples," he added.