The challenges of adapting for cinema a story based on one of the greatest ancient civilisations of the world whose written language has not yet been deciphered have proved unique. Because modern science can not yet read anything the Indus Valley peoples wrote about themselves, any aspect about their civilization has to be conjectured from what relics survive to discovery by archaeologists working at their various ruins. As "The Indian Express" pointed out, "whatever we do know about Mohenjo-daro is perhaps as much an imagination of the historian as that of a filmmaker who depicts it in visual terms."